SyncValsverifier → artifact → classifier → verdict
SyncVals · Trajectory

rust-lang-semver-305

codex gpt-5.5 ✓ resolved GOOD_SUCCESS ↑ View task
Solved from the instruction alone, tests/ and solution/ were withheld from the agent's workspace and restored only for grading.
Reward = tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.
Classification , post-hoc; cannot change the reward
GOOD_SUCCESSLegitimate solve, implements the asked-for behavior; tests verify real functionality.
SubtypeLegitimate Solution
EvidenceTrial passed all 4 verification tests: test_url_roundtrip_suite_passes, test_existing_url_unit_tests_still_pass, test_source_does_not_hardcode_held_back_literals, test_vendored_url_data_does_not_leak_hidden_rows. Agent executed cargo test -p url --locked with 61 unit tests + 66 doc tests all passing. Agent trajectory shows methodical exploration of codebase, understanding of the /. marker requirement from instructions, and proper implementation across lib.rs:256-317 (marker detection/insertion/removal), parser.rs:1372 (post-parse normalization), and slicing.rs:152 (position handling).
Root causeThe agent correctly implemented the complex non-special URL path marker feature by adding marker detection/insertion logic, ensuring proper normalization after parsing and joins, and maintaining correct slicing position semantics. All tests including existing unit tests and new marker-specific tests pass successfully.
RecommendationN/A - task is fine
Trajectory
Tool-by-tool agent trajectory
56 tool calls · 2 tool types · 79 steps
<permissions instructions> Filesystem sandboxing defines which files can be read or written. `sandbox_mode` is `danger-full-access`: No filesystem sandboxing - all commands are permitted. Network access is enabled. Approval policy is currently never. Do not provide the `sandbox_permissions` for any reason, commands will be rejected. </permissions instructions><apps_instructions> ## Apps (Connectors) Apps (Connectors) can be explicitly triggered in user messages in the format `[$app-name](app://{connector_id})`. Apps can also be implicitly triggered as long as the context suggests usage of available apps. An app is equivalent to a set of MCP tools within the `codex_apps` MCP. An installed app's MCP tools are either provided to you already, or can be lazy-loaded through the `tool_search` tool. If `tool_search` is available, the apps that are searchable by `tools_search` will be listed by it. Do not additionally call list_mcp_resources or list_mcp_resource_templates for apps. </apps_instructions><skills_instructions> ## Skills A skill is a set of instructions provided through a `SKILL.md` source. Below is the list of skills that can be used. Each entry includes a name, description, and source locator. `file` locators are on the host filesystem, `environment resource` locators are owned by an execution environment, `orchestrator resource` locators are opaque non-filesystem resources, and `custom resource` locators use their provider's access mechanism. ### Available skills - imagegen: Generate or edit raster images when the task benefits from AI-created bitmap visuals such as photos, illustrations, textures, sprites, mockups, or transparent-background cutouts. Use when Codex should create a brand-new image, transform an existing image, or derive visual variants from references, and the output should be a bitmap asset rather than repo-native code or vector. Do not use when the task is better handled by editing existing SVG/vector/code-native assets, extending an established icon or logo system, or building the visual directly in HTML/CSS/canvas. (file: /tmp/codex-home/skills/.system/imagegen/SKILL.md) - openai-docs: Use when the user asks how to build with OpenAI products or APIs, asks about Codex itself or choosing Codex surfaces, needs up-to-date official documentation with citations, help choosing the latest model for a use case, or model upgrade and prompt-upgrade guidance; use OpenAI docs MCP tools for non-Codex docs questions, use the Codex manual helper first for broad Codex self-knowledge, and restrict fallback browsing to official OpenAI domains. (file: /tmp/codex-home/skills/.system/openai-docs/SKILL.md) - plugin-creator: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default. Use when Codex needs to create a new personal plugin, add optional plugin structure, generate or update marketplace entries for plugin ordering and availability metadata, or update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow. (file: /tmp/codex-home/skills/.system/plugin-creator/SKILL.md) - skill-creator: Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Codex's capabilities with specialized knowledge, workflows, or tool integrations. (file: /tmp/codex-home/skills/.system/skill-creator/SKILL.md) - skill-installer: Install Codex skills into $CODEX_HOME/skills from a curated list or a [code-host] repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos). (file: /tmp/codex-home/skills/.system/skill-installer/SKILL.md) ### How to use skills - Discovery: The list above is the skills available in this session (name + description + source locator). `file` entries live on the host filesystem, `environment resource` entries are owned by their execution environment, `orchestrator resource` entries must be accessed through `skills.list` and `skills.read`, and `custom resource` entries use their provider's access mechanism. - Trigger rules: If the user names a skill (with `$SkillName` or plain text) OR the task clearly matches a skill's description shown above, you must use that skill for that turn. Multiple mentions mean use them all. Do not carry skills across turns unless re-mentioned. - Missing/blocked: If a named skill isn't in the list or its source can't be read, say so briefly and continue with the best fallback. - How to use a skill (progressive disclosure): 1) After deciding to use a skill, the main agent must read its `SKILL.md` completely before taking task actions. For a `file` entry, open the listed path. For an `environment resource`, use the filesystem of the owning environment. For an `orchestrator resource`, call `skills.list` with `{"authority":{"kind":"orchestrator"}}`, select the matching package, and pass its `main_resource` to `skills.read`. If a read is truncated or paginated, continue until EOF. 2) When `SKILL.md` references another resource, use the same access mechanism. Resolve relative paths against a filesystem-backed skill directory. For orchestrator skills, pass the exact referenced resource identifier with the same authority and package to `skills.read`; do not treat `skill://` identifiers as filesystem paths. 3) If `SKILL.md` points to extra folders such as `references/`, use its routing instructions to identify the resources required for the task. The main agent must read each required instruction or reference file itself before acting on it. Do not delegate reading, summarizing, or interpreting skill instructions to a subagent. Subagents may still perform task work when the selected skill allows it. 4) For filesystem-backed skills, prefer running or patching provided scripts instead of retyping large code blocks. For orchestrator skills, use `skills.read` and the available tools; do not invent a local path. 5) Reuse provided assets or templates through the same source access mechanism instead of recreating them. - Coordination and sequencing: - If multiple skills apply, choose the minimal set that covers the request and state the order you'll use them. - Announce which skill(s) you're using and why (one short line). If you skip an obvious skill, say why. - Context hygiene: - Progressive disclosure applies to selecting relevant files, not partially reading a selected instruction file. Do not load unrelated references, scripts, or assets. - Avoid deep reference-chasing: prefer opening only files directly linked from `SKILL.md` unless you're blocked. - When variants exist (frameworks, providers, domains), pick only the relevant reference file(s) and note that choice. - Safety and fallback: If a skill can't be applied cleanly (missing files, unclear instructions), state the issue, pick the next-best approach, and continue. </skills_instructions>
<environment_context> <cwd>/app</cwd> <shell>bash</shell> <current_date>2026-06-21</current_date> <timezone>Etc/UTC</timezone> <filesystem><workspace_roots><root>/app</root></workspace_roots><permission_profile type="disabled"><file_system type="unrestricted" /></permission_profile></filesystem> </environment_context>
A Rust URL parsing workspace lives at /app. It exposes URL parsing, joining, serialization, path and host accessors, and public slicing positions. A parsed or joined URL should round-trip through serialization and parsing while preserving scheme, host, path, query, fragment, and slicing behavior. Fix non-special URLs with no host or authority whose logical path starts with //. When serializing that shape, insert the text /. between the scheme or port boundary and the logical path so reparsing does not treat the path as an authority. The marker is serialized text only: path() still returns the logical path without it, Position::AfterPort points before it, Position::BeforePath points after it, and the slice between those positions is /. for affected URLs. Joins must recompute the marker after path resolution. A join that leaves an affected // logical path keeps it; a join that resolves back to a single leading slash removes it, including parent-directory relative joins. Query-only and fragment-only joins preserve the existing path shape. Host-bearing URLs and special schemes keep their existing behavior. The relevant code paths are the non-special parser, relative join resolution, serialization, path accessors, and slicing positions in url/src/parser.rs, url/src/lib.rs, and url/src/slicing.rs. Apply the marker after dot-segment path normalization, and keep Position::AfterPort distinct from Position::BeforePath when the marker exists. Do not reject valid inputs or change public APIs. Build with cargo build --locked after the change.
I’ll inspect the Rust workspace and the URL internals first, then patch the narrow paths around parsing, joining, serialization, and slicing. After that I’ll run the locked build.
shell
pwd && rg -n "BeforePath|AfterPort|non-special|cannot-be-a-base|path_start|serialization|serialize|join|relative|Position" url/src -S
output
Chunk ID: ec4e39
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 10052
Output:
Total output lines: 516

/app
url/src/host.rs:15:use serde::{Deserialize, Serialize};
url/src/host.rs:19:#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
url/src/host.rs:40:#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
url/src/host.rs:45:    /// a special URL, or percent encoded for non-special URLs. Hosts for
url/src/host.rs:46:    /// non-special URLs are also called opaque hosts.
url/src/host.rs:50:    /// `Url::host_str` returns the serialization of this address,
url/src/host.rs:55:    /// `Url::host_str` returns the serialization of that address between `[` and `]` brackets,
url/src/host.rs:223:// https://url.spec.whatwg.org/#concept-ipv6-serializer step 2 and 3
url/src/host.rs:250:    // https://url.spec.whatwg.org/#concept-ipv6-serializer
url/src/slicing.rs:15:        &self.serialization
url/src/slicing.rs:19:impl Index<RangeFrom<Position>> for Url {
url/src/slicing.rs:21:    fn index(&self, range: RangeFrom<Position>) -> &str {
url/src/slicing.rs:22:        &self.serialization[self.index(range.start)..]
url/src/slicing.rs:26:impl Index<RangeTo<Position>> for Url {
url/src/slicing.rs:28:    fn index(&self, range: RangeTo<Position>) -> &str {
url/src/slicing.rs:29:        &self.serialization[..self.index(range.end)]
url/src/slicing.rs:33:impl Index<Range<Position>> for Url {
url/src/slicing.rs:35:    fn index(&self, range: Range<Position>) -> &str {
url/src/slicing.rs:36:        &self.serialization[self.index(range.start)..self.index(range.end)]
url/src/slicing.rs:45:/// # use url::{Url, Position};
url/src/slicing.rs:47:/// let serialization: &str = &some_url[..];
url/src/slicing.rs:48:/// let serialization_without_fragment: &str = &some_url[..Position::AfterQuery];
url/src/slicing.rs:49:/// let authority: &str = &some_url[Position::BeforeUsername..Position::AfterPort];
url/src/slicing.rs:50:/// let data_url_payload: &str = &some_url[Position::BeforePath..Position::AfterQuery];
url/src/slicing.rs:51:/// let scheme_relative: &str = &some_url[Position::BeforeUsername..];
url/src/slicing.rs:81:pub enum Position {
url/src/slicing.rs:91:    AfterPort,
url/src/slicing.rs:92:    BeforePath,
url/src/slicing.rs:102:    fn index(&self, position: Position) -> usize {
url/src/slicing.rs:104:            Position::BeforeScheme => 0,
url/src/slicing.rs:106:            Position::AfterScheme => self.scheme_end as usize,
url/src/slicing.rs:108:            Position::BeforeUsername => {
url/src/slicing.rs:118:            Position::AfterUsername => self.username_end as usize,
url/src/slicing.rs:120:            Position::BeforePassword => {
url/src/slicing.rs:129:            Position::AfterPassword => {
url/src/slicing.rs:139:            Position::BeforeHost => self.host_start as usize,
url/src/slicing.rs:141:            Position::AfterHost => self.host_end as usize,
url/src/slicing.rs:143:            Position::BeforePort => {
url/src/slicing.rs:152:            Position::AfterPort => self.path_start as usize,
url/src/slicing.rs:154:            Position::BeforePath => self.path_start as usize,
url/src/slicing.rs:156:            Position::AfterPath => match (self.query_start, self.fragment_start) {
url/src/slicing.rs:159:                (None, None) => self.serialization.len(),
url/src/slicing.rs:162:            Position::BeforeQuery => match (self.query_start, self.fragment_start) {
url/src/slicing.rs:168:                (None, None) => self.serialization.len(),
url/src/slicing.rs:171:            Position::AfterQuery => match self.fragment_start {
url/src/slicing.rs:172:                None => self.serialization.len(),
url/src/slicing.rs:176:            Position::BeforeFragment => match self.fragment_start {
url/src/slicing.rs:181:                None => self.serialization.len(),
url/src/slicing.rs:184:            Position::AfterFragment => self.serialization.len(),
url/src/origin.rs:75:    pub fn ascii_serialization(&self) -> String {
url/src/origin.rs:89:    pub fn unicode_serialization(&self) -> String {
url/src/quirks.rs:15:use crate::{Host, ParseError, Position, Url};
url/src/quirks.rs:23:///      |      |    |          | |   `----------------- path_start
url/src/quirks.rs:37:    pub path_start: u32,
url/src/quirks.rs:44:/// This can be useful for implementing efficient serialization
url/src/quirks.rs:54:        path_start: url.path_start,
url/src/quirks.rs:92:    url.origin().ascii_serialization()
url/src/quirks.rs:143:    &url[Position::BeforeHost..Position::AfterPort]
url/src/quirks.rs:149:    // If context object’s url’s cannot-be-a-base-URL flag is set, then return.
url/src/quirks.rs:238:    &url[Position::BeforePort..Position::AfterPort]
url/src/quirks.rs:291:    trim(&url[Position::AfterPath..Position::AfterQuery])
url/src/quirks.rs:305:    trim(&url[Position::AfterQuery..])
url/src/lib.rs:28:use url::{Url, Host, Position};
url/src/lib.rs:46:assert!(&issue_list_url[Position::BeforePath..] == "/rust-lang/rust/issues?labels=E-easy&state=open");
url/src/lib.rs:54:Some URLs are said to be *cannot-be-a-base*:
url/src/lib.rs:78:Enable the `serde` feature to include `Deserialize` and `Serialize` implementations for `url::Url`.
url/src/lib.rs:82:Many contexts allow URL *references* that can be relative to a *base URL*:
url/src/lib.rs:88:Since parsed URLs are absolute, giving a base is required for parsing relative URLs:
url/src/lib.rs:96:Use the `join` method on an `Url` to use it as a base URL:
url/src/lib.rs:104:let css_url = this_document.join("../main.css")?;
url/src/lib.rs:115:[`serde::Deserialize`](https://docs.rs/serde/1/serde/trait.Deserialize.html).
url/src/lib.rs:156:pub use crate::slicing::Position;
url/src/lib.rs:180:    serialization: String,
url/src/lib.rs:189:    path_start: u32,            // Before initial '/', if any
url/src/lib.rs:190:    query_start: Option<u32>,   // Before '?', unlike Position::QueryStart
url/src/lib.rs:191:    fragment_start: Option<u32>, // Before '#', unlike Position::FragmentStart
url/src/lib.rs:246:            serialization: String::with_capacity(input.len()),
url/src/lib.rs:340:            .serialization
url/src/lib.rs:346:        let start = self.serialization.len() - trailing_space_count;
url/src/lib.rs:348:        self.serialization.truncate(start);
url/src/lib.rs:353:    /// The inverse of this is [`make_relative`].
url/src/lib.rs:367:    /// let url = base.join("c.png")?;
url/src/lib.rs:371:    /// let url = base.join("c.png")?;
url/src/lib.rs:384:    /// [`make_relative`]: #method.make_relative
url/src/lib.rs:386:    pub fn join(&self, input: &str) -> Result<Url, crate::ParseError> {
url/src/lib.rs:390:    /// Creates a relative URL if possible, with this URL as the base URL.
url/src/lib.rs:392:    /// This is the inverse of [`join`].
url/src/lib.rs:403:    /// let relative = base.make_relative(&url);
url/src/lib.rs:404:    /// assert_eq!(relative.as_ref().map(|s| s.as_str()), Some("c.png"));
url/src/lib.rs:408:    /// let relative = base.make_relative(&url);
url/src/lib.rs:409:    /// assert_eq!(relative.as_ref().map(|s| s.as_str()), Some("c.png"));
url/src/lib.rs:413:    /// let relative = base.make_relative(&url);
url/src/lib.rs:414:    /// assert_eq!(relative.as_ref().map(|s| s.as_str()), Some("../d/c.png"));
url/src/lib.rs:418:    /// let relative = base.make_relative(&url);
url/src/lib.rs:419:    /// assert_eq!(relative.as_ref().map(|s| s.as_str()), Some("?e=f"));
url/src/lib.rs:430:    /// [`join`]: #method.join
url/src/lib.rs:431:    pub fn make_relative(&self, url: &Url) -> Option<String> {
url/src/lib.rs:444:        let mut relative = String::new();
url/src/lib.rs:476:            if !relative.is_empty() {
url/src/lib.rs:477:                relative.push('/');
url/src/lib.rs:480:            relative.push_str("..");
url/src/lib.rs:485:            if !relative.is_empty() {
url/src/lib.rs:486:                relative.push('/');
url/src/lib.rs:489:            relative.push_str(url_path_segment);
url/src/lib.rs:493:        if !relative.is_empty() || base_filename != url_filename {
url/src/lib.rs:499:                relative.push('/');
url/src/lib.rs:501:                if !relative.is_empty() {
url/src/lib.rs:502:                    relative.push('/');
url/src/lib.rs:504:                relative.push_str(url_filename);
url/src/lib.rs:510:            relative.push('?');
url/src/lib.rs:511:            relative.push_str(query);
url/src/lib.rs:515:            relative.push('#');
url/src/lib.rs:516:            relative.push_str(fragment);
url/src/lib.rs:519:        Some(relative)
url/src/lib.rs:549:    /// Return the serialization of this URL.
url/src/lib.rs:551:    /// This is fast since that serialization is already stored in the `Url` struct.
url/src/lib.rs:569:        &self.serialization
url/src/lib.rs:572:    /// Return the serialization of this URL.
url/src/lib.rs:609:                        self.serialization
url/src/lib.rs:623:                                           self.serialization))
url/src/lib.rs:639:            if self.username_end != self.serialization.len() as u32 {
url/src/lib.rs:665:            if self.path_start == self.host_end {
url/src/lib.rs:669:                let port_str = self.slice(self.host_end + 1..self.path_start);
url/src/lib.rs:676:                self.path_start as usize == self.serialization.len()
url/src/lib.rs:677:                    || matches!(self.byte_at(self.path_start), b'/' | b'#' | b'?')
url/src/lib.rs:686:            assert_eq!(self.path_start, self.scheme_end + 1);
url/src/lib.rs:689:            assert!(start >= self.path_start);
url/src/lib.rs:693:            assert!(start >= self.path_start);
url/src/lib.rs:701:        assert_eq!(&self.serialization, &other.serialization);
url/src/lib.rs:713:        assert_eq!(self.path_start, other.path_start);
url/src/lib.rs:819:    /// or cannot-be-a-base like `data:text/plain,Stuff`.
url/src/lib.rs:851:    /// of a special URL, or percent encoded for non-special URLs.
url/src/lib.rs:882:        if self.has_authority() && self.path_start > self.scheme_end + scheme_separator_len {
url/src/lib.rs:883:            self.slice(self.scheme_end + scheme_separator_len..self.path_start)
url/src/lib.rs:889:    /// Return whether this URL is a cannot-be-a-base URL,
url/src/lib.rs:890:    /// meaning that parsing a relative URL string with this URL as the base will return an error.
url/src/lib.rs:978:            && self.username_end != self.serialization.len() as u32
url/src/lib.rs:1016:    /// of a special URL, or percent encoded for non-special URLs.
url/src/lib.rs:1056:    /// of a special URL, or percent encoded for non-special URLs.
url/src/lib.rs:1096:    /// of a special URL, or percent encoded for non-special URLs.
url/src/lib.rs:1126:    /// Note that default port numbers are never reflected by the serialization,
url/src/lib.rs:1241:    /// For cannot-be-a-base URLs, this is an arbitrary string that doesn’t start with '/'.
url/src/lib.rs:1265:            (None, None) => self.slice(self.path_start..),
url/src/lib.rs:1267:                self.slice(self.path_start..next_component_start)
url/src/lib.rs:1272:    /// Unless this URL is cannot-be-a-base,
url/src/lib.rs:1276:    /// Return `None` for cannot-be-a-base URLs.
url/src/lib.rs:1422:        let mut parser = Parser::for_setter(mem::take(&mut self.serialization));
url/src/lib.rs:1424:        self.serialization = parser.serialization;
url/src/lib.rs:1455:            self.serialization.truncate(start as usize);
url/src/lib.rs:1459:            self.fragment_start = Some(to_u32(self.serialization.len()).unwrap());
url/src/lib.rs:1460:            self.serialization.push('#');
url/src/lib.rs:1472:            self.serialization.truncate(start as usize);
url/src/lib.rs:1480:            self.fragment_start = Some(to_u32(self.serialization.len()).unwrap());
url/src/lib.rs:1481:            self.serialization.push('#');
url/src/lib.rs:1482:            self.serialization.push_str(fragment);
url/src/lib.rs:1511:            self.serialization.truncate(start as usize);
url/src/lib.rs:1515:            self.query_start = Some(to_u32(self.serialization.len()).unwrap());
url/src/lib.rs:1516:            self.serialization.push('?');
url/src/lib.rs:1575:            query_start = self.serialization.len();
url/src/lib.rs:1577:            self.serialization.push('?');
url/src/lib.rs:1591:                self.serialization.truncate(i as usize);
url/src/lib.rs:1635:        let old_after_path_pos = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1638:        self.serialization.truncate(self.path_start as usize);
url/src/lib.rs:1642:                    parser.serialization.push_str("%2F");
url/src/lib.rs:1648:                parser.parse_path_start(scheme_type, &mut has_host, parser::Input::new(path));
url/src/lib.rs:1656:    /// Return `Err(())` if this URL is cannot-be-a-base.
url/src/lib.rs:1667:        let new_after_path_position = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1678:        self.serialization.push_str(after_path)
url/src/lib.rs:1683:    /// Note that default port numbers are not reflected in the serialization.
url/src/lib.rs:1685:    /// If this URL is cannot-be-a-base, does not have a host, or has the `file` scheme;
url/src/lib.rs:1723:    /// Cannot set port for cannot-be-a-base URLs:
url/src/lib.rs:1758:                self.serialization
url/src/lib.rs:1759:                    .drain(self.host_end as usize..self.path_start as usize);
url/src/lib.rs:1760:                let offset = self.path_start - self.host_end;
url/src/lib.rs:1761:                self.path_start = self.host_end;
url/src/lib.rs:1771:                let path_and_after = self.slice(self.path_start..).to_owned();
url/src/lib.rs:1772:                self.serialization.truncate(self.host_end as usize);
url/src/lib.rs:1773:                write!(&mut self.serialization, ":{}", new).unwrap();
url/src/lib.rs:1774:                let old_path_start = self.path_start;
url/src/lib.rs:1775:                let new_path_start = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1776:                self.path_start = new_path_start;
url/src/lib.rs:1778:                    *index -= old_path_start;
url/src/lib.rs:1779:                    *index += new_path_start;
url/src/lib.rs:1787:                self.serialization.push_str(&path_and_after);
url/src/lib.rs:1848:    /// Cannot change or remove host for cannot-be-a-base URLs:
url/src/lib.rs:1871:    /// If this URL is cannot-be-a-base or there is an error parsing the given `host`,
url/src/lib.rs:1909:            } else if self.serialization.len() == self.path_start as usize {
url/src/lib.rs:1910:                self.serialization.push('/');
url/src/lib.rs:1913:            debug_assert!(self.byte_at(self.path_start) == b'/');
url/src/lib.rs:1915:            let new_path_start = if scheme_type.is_file() {
url/src/lib.rs:1921:            self.serialization
url/src/lib.rs:1922:                .drain(new_path_start as usize..self.path_start as usize);
url/src/lib.rs:1923:            let offset = self.path_start - new_path_start;
url/src/lib.rs:1924:            self.path_start = new_path_start;
url/src/lib.rs:1925:            self.username_end = new_path_start;
url/src/lib.rs:1926:            self.host_start = new_path_start;
url/src/lib.rs:1927:            self.host_end = new_path_start;
url/src/lib.rs:1942:            self.path_start
url/src/lib.rs:1947:        self.serialization.truncate(self.host_start as usize);
url/src/lib.rs:1951:            self.serialization.push('/');
url/src/lib.rs:1952:            self.serialization.push('/');
url/src/lib.rs:1956:        write!(&mut self.serialization, "{}", host).unwrap();
url/src/lib.rs:1957:        self.host_end = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1963:                write!(&mut self.serialization, ":{}", port).unwrap();
url/src/lib.rs:1966:        let new_suffix_pos = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1967:        self.serialization.push_str(&suffix);
url/src/lib.rs:1973:        adjust(&mut self.path_start);
url/src/lib.rs:1984:    /// If this URL is cannot-be-a-base, do nothing and return `Err`.
url/src/lib.rs:2035:    /// If this URL is cannot-be-a-base or does not have a host, do nothing and return `Err`.
url/src/lib.rs:2067:            self.serialization.truncate(self.username_end as usize);
url/src/lib.rs:2068:            self.serialization.push(':');
url/src/lib.rs:2069:            self.serialization
url/src/lib.rs:2071:            self.serialization.push('@');
url/src/lib.rs:2074:            let new_host_start = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:2081:            adjust(&mut self.path_start);
url/src/lib.rs:2089:            self.serialization.push_str(&host_and_after);
url/src/lib.rs:2102:            self.serialization.drain(start as usize..end as usize);
url/src/lib.rs:2106:            self.path_start -= offset;
url/src/lib.rs:2119:    /// If this URL is cannot-be-a-base or does not have a host, do nothing and return `Err`.
url/src/lib.rs:2164:        self.serialization.truncate(username_start as usize);
url/src/lib.rs:2165:        self.serialization
url/src/lib.rs:2169:        self.username_end = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:2176:                self.serialization.push_str(&after_username[1..]);
url/src/lib.rs:2179:                self.serialization.push_str(&after_username);
url/src/lib.rs:2183:                self.serialization.push('@');
url/src/lib.rs:2184:                self.serialization.push_str(&after_username);
url/src/lib.rs:2194:        adjust(&mut self.path_start);
url/src/lib.rs:2209:    /// * If this URL is cannot-be-a-base and the new scheme is one of
url/src/lib.rs:2269:    /// Cannot change URL’s scheme from `mailto` (cannot-be-a-base) to `https`:
url/src/lib.rs:2318:        let new_scheme_type = SchemeType::from(&parser.serialization);
url/src/lib.rs:2335:        let new_scheme_end = to_u32(parser.serialization.len()).unwrap();
url/src/lib.rs:2345:        adjust(&mut self.path_start);
url/src/lib.rs:2353:        parser.serialization.push_str(self.slice(old_scheme_end..));
url/src/lib.rs:2354:        self.serialization = parser.serialization;
url/src/lib.rs:2396:        let mut serialization = "file://".to_owned();
url/src/lib.rs:2397:        let host_start = serialization.len() as u32;
url/src/lib.rs:2398:        let (host_end, host) = path_to_file_url_segments(path.as_ref(), &mut serialization)?;
url/src/lib.rs:2400:            serialization,
url/src/lib.rs:2407:            path_start: host_end,
url/src/lib.rs:2434:        if !url.serialization.ends_with('/') {
url/src/lib.rs:2435:            url.serialization.push('/')
url/src/lib.rs:2442:    /// The corresponding `deserialize_internal` method sacrifices some invariant-checking
url/src/lib.rs:2443:    /// for speed, compared to the `Deserialize` trait impl.
url/src/lib.rs:2448:    pub fn serialize_internal<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
url/src/lib.rs:2456:            ref serialization,
url/src/lib.rs:2463:            ref path_start,
url/src/lib.rs:2468:            serialization,
url/src/lib.rs:2475:            path_start,
url/src/lib.rs:2479:            .serialize(serializer)
url/src/lib.rs:2484:    /// The corresponding `deserialize_internal` method sacrifices some invariant-checking
url/src/lib.rs:2485:    /// for speed, compared to the `Deserialize` trait impl.
url/src/lib.rs:2490:    pub fn deserialize_internal<'de, D>(deserializer: D) -> Result<Self, D::Error>
url/src/lib.rs:2492:        D: serde::Deserializer<'de>,
url/src/lib.rs:2494:        use serde::de::{Deserialize, Error, Unexpected};
url/src/lib.rs:2496:            serialization,
url/src/lib.rs:2503:            path_start,
url/src/lib.rs:2506:        ) = Deserialize::deserialize(deserializer)?;
url/src/lib.rs:2508:            serialization,
url/src/lib.rs:2515:            path_start,
url/src/lib.rs:2554:                    Some(&self.serialization[self.host_start as usize..self.host_end as usize…52 tokens truncated…c/lib.rs:2602:        fmt::Display::fmt(&self.serialization, formatter)
url/src/lib.rs:2609:        value.serialization
url/src/lib.rs:2613:/// Debug the serialization of this URL.
url/src/lib.rs:2632:/// URLs compare like their serialization.
url/src/lib.rs:2635:/// URLs compare like their serialization.
url/src/lib.rs:2639:        self.serialization == other.serialization
url/src/lib.rs:2643:/// URLs compare like their serialization.
url/src/lib.rs:2647:        self.serialization.cmp(&other.serialization)
url/src/lib.rs:2651:/// URLs compare like their serialization.
url/src/lib.rs:2655:        self.serialization.partial_cmp(&other.serialization)
url/src/lib.rs:2659:/// URLs hash like their serialization.
url/src/lib.rs:2666:        hash::Hash::hash(&self.serialization, state)
url/src/lib.rs:2670:/// Return the serialization of this URL.
url/src/lib.rs:2674:        &self.serialization
url/src/lib.rs:2708:    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
url/src/lib.rs:2712:        serializer.serialize_str(self.as_str())
url/src/lib.rs:2716:/// Deserializes this URL from a `serde` stream.
url/src/lib.rs:2720:impl<'de> serde::Deserialize<'de> for Url {
url/src/lib.rs:2721:    fn deserialize<D>(deserializer: D) -> Result<Url, D::Error>
url/src/lib.rs:2723:        D: serde::Deserializer<'de>,
url/src/lib.rs:2747:        deserializer.deserialize_str(UrlVisitor)
url/src/lib.rs:2754:    serialization: &mut String,
url/src/lib.rs:2763:    let host_end = to_u32(serialization.len()).unwrap();
url/src/lib.rs:2768:        serialization.push('/');
url/src/lib.rs:2769:        serialization.extend(percent_encode(
url/src/lib.rs:2776:        serialization.push('/');
url/src/lib.rs:2784:    serialization: &mut String,
url/src/lib.rs:2786:    path_to_file_url_segments_windows(path, serialization)
url/src/lib.rs:2793:    serialization: &mut String,
url/src/lib.rs:2801:    let host_start = serialization.len() + 1;
url/src/lib.rs:2808:                host_end = to_u32(serialization.len()).unwrap();
url/src/lib.rs:2810:                serialization.push('/');
url/src/lib.rs:2811:                serialization.push(letter as char);
url/src/lib.rs:2812:                serialization.push(':');
url/src/lib.rs:2816:                write!(serialization, "{}", host).unwrap();
url/src/lib.rs:2817:                host_end = to_u32(serialization.len()).unwrap();
url/src/lib.rs:2819:                serialization.push('/');
url/src/lib.rs:2821:                serialization.extend(percent_encode(share.as_bytes(), PATH_SEGMENT));
url/src/lib.rs:2838:        serialization.push('/');
url/src/lib.rs:2839:        serialization.extend(percent_encode(component.as_bytes(), PATH_SEGMENT));
url/src/lib.rs:2843:    if serialization.len() > host_start
url/src/lib.rs:2844:        && parser::is_windows_drive_letter(&serialization[host_start..])
url/src/lib.rs:2847:        serialization.push('/');
url/src/lib.rs:2966:// `as_mut_string` string here exposes the internal serialization of an `Url`,
url/src/lib.rs:2978:        &mut self.url.as_mut().unwrap().serialization
url/src/path_segments.rs:47:    let old_after_path_position = to_u32(url.serialization.len()).unwrap();
url/src/path_segments.rs:50:        debug_assert!(url.byte_at(url.path_start) == b'/');
url/src/path_segments.rs:53:            url.serialization.len() == url.path_start as usize
url/src/path_segments.rs:54:                || url.byte_at(url.path_start) == b'/'
url/src/path_segments.rs:58:        after_first_slash: url.path_start as usize + "/".len(),
url/src/path_segments.rs:93:        self.url.serialization.truncate(self.after_first_slash);
url/src/path_segments.rs:126:        if self.after_first_slash >= self.url.serialization.len() {
url/src/path_segments.rs:129:        if self.url.serialization[self.after_first_slash..].ends_with('/') {
url/src/path_segments.rs:130:            self.url.serialization.pop();
url/src/path_segments.rs:141:        if self.after_first_slash >= self.url.serialization.len() {
url/src/path_segments.rs:144:        let last_slash = self.url.serialization[self.after_first_slash..]
url/src/path_segments.rs:148:            .serialization
url/src/path_segments.rs:164:    /// Each segment is percent-encoded like in `Url::parse` or `Url::join`,
url/src/path_segments.rs:176:    /// To obtain a behavior similar to `Url::join`, call `.pop()` unconditionally first.
url/src/path_segments.rs:199:    /// In order to make sure that parsing the serialization of an URL gives the same URL,
url/src/path_segments.rs:221:        let path_start = self.url.path_start as usize;
url/src/path_segments.rs:229:                if parser.serialization.len() > path_start + 1
url/src/path_segments.rs:231:                    || parser.serialization.len() == path_start
url/src/path_segments.rs:233:                    parser.serialization.push('/');
url/src/path_segments.rs:239:                    path_start,
url/src/parser.rs:84:    RelativeUrlWithoutBase => "relative URL without a base",
url/src/parser.rs:85:    RelativeUrlWithCannotBeABaseBase => "relative URL with a cannot-be-a-base base",
url/src/parser.rs:86:    SetHostOnCannotBeABaseUrl => "a cannot-be-a-base URL doesn’t have a host to set",
url/src/parser.rs:322:    pub serialization: String,
url/src/parser.rs:351:    pub fn for_setter(serialization: String) -> Parser<'a> {
url/src/parser.rs:353:            serialization,
url/src/parser.rs:379:                    self.parse_relative(input, scheme_type, base_url)
url/src/parser.rs:391:        debug_assert!(self.serialization.is_empty());
url/src/parser.rs:395:                    self.serialization.push(c.to_ascii_lowercase())
url/src/parser.rs:399:                    self.serialization.clear();
url/src/parser.rs:408:            self.serialization.clear();
url/src/parser.rs:415:        let scheme_end = to_u32(self.serialization.len())?;
url/src/parser.rs:416:        let scheme_type = SchemeType::from(&self.serialization);
url/src/parser.rs:417:        self.serialization.push(':');
url/src/parser.rs:428:                self.serialization.clear();
url/src/parser.rs:432:                // special relative or authority state
url/src/parser.rs:436:                        && base_url.scheme() == &self.serialization[..scheme_end as usize]
url/src/parser.rs:440:                        self.serialization.clear();
url/src/parser.rs:441:                        return self.parse_relative(input, scheme_type, base_url);
url/src/parser.rs:470:        let path_start = to_u32(self.serialization.len())?;
url/src/parser.rs:471:        let username_end = path_start;
url/src/parser.rs:472:        let host_start = path_start;
url/src/parser.rs:473:        let host_end = path_start;
url/src/parser.rs:477:            let path_start = self.serialization.len();
url/src/parser.rs:478:            self.serialization.push('/');
url/src/parser.rs:479:            self.parse_path(scheme_type, &mut false, path_start, input)
url/src/parser.rs:491:            path_start,
url/src/parser.rs:504:        debug_assert!(self.serialization.is_empty());
url/src/parser.rs:513:                self.serialization.push_str("file://");
url/src/parser.rs:516:                let (path_start, mut host, remaining) =
url/src/parser.rs:518:                let mut host_end = to_u32(self.serialization.len())?;
url/src/parser.rs:520:                let remaining = if path_start {
url/src/parser.rs:521:                    self.parse_path_start(SchemeType::File, &mut has_host, remaining)
url/src/parser.rs:523:                    let path_start = self.serialization.len();
url/src/parser.rs:524:                    self.serialization.push('/');
url/src/parser.rs:525:                    self.parse_path(SchemeType::File, &mut has_host, path_start, remaining)
url/src/parser.rs:531:                    self.serialization
url/src/parser.rs:539:                    serialization: self.serialization,
url/src/parser.rs:546:                    path_start: host_end,
url/src/parser.rs:551:                self.serialization.push_str("file://");
url/src/parser.rs:560:                            self.serialization.push('/');
url/src/parser.rs:561:                            self.serialization.push_str(first_segment);
url/src/parser.rs:563:                            self.serialization.push_str(host_str);
url/src/parser.rs:564:                            host_end = self.serialization.len();
url/src/parser.rs:590:                    serialization: self.serialization,
url/src/parser.rs:597:                    path_start: host_end,
url/src/parser.rs:608:                        Some(i) => &base_url.serialization[..i as usize],
url/src/parser.rs:609:                        None => &*base_url.serialization,
url/src/parser.rs:611:                    self.serialization.push_str(before_fragment);
url/src/parser.rs:613:                        serialization: self.serialization,
url/src/parser.rs:621:                        (None, None) => &*base_url.serialization,
url/src/parser.rs:624:                    self.serialization.push_str(before_query);
url/src/parser.rs:628:                        serialization: self.serialization,
url/src/parser.rs:638:                            (None, None) => &*base_url.serialization,
url/src/parser.rs:641:                        self.serialization.push_str(before_query);
url/src/parser.rs:642:                        self.shorten_path(SchemeType::File, base_url.path_start as usize);
url/src/parser.rs:646:                            base_url.path_start as usize,
url/src/parser.rs:657:                            base_url.path_start,
url/src/parser.rs:661:                        self.serialization.push_str("file:///");
url/src/parser.rs:663:                        let path_start = "file://".len();
url/src/parser.rs:665:                            self.parse_path(SchemeType::File, &mut false, path_start, input);
url/src/parser.rs:668:                        let path_start = path_start as u32;
url/src/parser.rs:670:                            serialization: self.serialization,
url/src/parser.rs:672:                            username_end: path_start,
url/src/parser.rs:673:                            host_start: path_start,
url/src/parser.rs:674:                            host_end: path_start,
url/src/parser.rs:677:                            path_start,
url/src/parser.rs:685:            self.serialization.push_str("file:///");
url/src/parser.rs:687:            let path_start = "file://".len();
url/src/parser.rs:688:            let remaining = self.parse_path(SchemeType::File, &mut false, path_start, input);
url/src/parser.rs:691:            let path_start = path_start as u32;
url/src/parser.rs:693:                serialization: self.serialization,
url/src/parser.rs:695:                username_end: path_start,
url/src/parser.rs:696:                host_start: path_start,
url/src/parser.rs:697:                host_end: path_start,
url/src/parser.rs:700:                path_start,
url/src/parser.rs:707:    fn parse_relative(
url/src/parser.rs:713:        // relative state
url/src/parser.rs:714:        debug_assert!(self.serialization.is_empty());
url/src/parser.rs:720:                    Some(i) => &base_url.serialization[..i as usize],
url/src/parser.rs:721:                    None => &*base_url.serialization,
url/src/parser.rs:723:                self.serialization.push_str(before_fragment);
url/src/parser.rs:725:                    serialization: self.serialization,
url/src/parser.rs:733:                    (None, None) => &*base_url.serialization,
url/src/parser.rs:736:                self.serialization.push_str(before_query);
url/src/parser.rs:740:                    serialization: self.serialization,
url/src/parser.rs:759:                    self.serialization
url/src/parser.rs:766:                let path_start = base_url.path_start;
url/src/parser.rs:767:                self.serialization.push_str(base_url.slice(..path_start));
url/src/parser.rs:768:                self.serialization.push('/');
url/src/parser.rs:772:                    path_start as usize,
url/src/parser.rs:783:                    base_url.path_start,
url/src/parser.rs:789:                    (None, None) => &*base_url.serialization,
url/src/parser.rs:792:                self.serialization.push_str(before_query);
url/src/parser.rs:794:                self.pop_path(scheme_type, base_url.path_start as usize);
url/src/parser.rs:797:                if self.serialization.len() == base_url.path_start as usize
url/src/parser.rs:800:                    self.serialization.push('/');
url/src/parser.rs:806:                        base_url.path_start as usize,
url/src/parser.rs:810:                        self.parse_path(scheme_type, &mut true, base_url.path_start as usize, input)
url/src/parser.rs:821:                    base_url.path_start,
url/src/parser.rs:834:        self.serialization.push('/');
url/src/parser.rs:835:        self.serialization.push('/');
url/src/parser.rs:837:        let before_authority = self.serialization.len();
url/src/parser.rs:839:        let has_authority = before_authority != self.serialization.len();
url/src/parser.rs:841:        let host_start = to_u32(self.serialization.len())?;
url/src/parser.rs:848:        let path_start = to_u32(self.serialization.len())?;
url/src/parser.rs:849:        let remaining = self.parse_path_start(scheme_type, &mut true, remaining);
url/src/parser.rs:858:            path_start,
url/src/parser.rs:889:            None => return Ok((to_u32(self.serialization.len())?, input)),
url/src/parser.rs:900:                return Ok((to_u32(self.serialization.len())?, remaining));
url/src/parser.rs:913:                username_end = Some(to_u32(self.serialization.len())?);
url/src/parser.rs:916:                    self.serialization.push(':');
url/src/parser.rs:924:                self.serialization
url/src/parser.rs:930:            None => to_u32(self.serialization.len())?,
url/src/parser.rs:933:            self.serialization.push('@');
url/src/parser.rs:945:        write!(&mut self.serialization, "{}", host).unwrap();
url/src/parser.rs:946:        let host_end = to_u32(self.serialization.len())?;
url/src/parser.rs:960:            let scheme = || default_port(&self.serialization[..scheme_end as usize]);
url/src/parser.rs:966:            write!(&mut self.serialization, ":{}", port).unwrap()
url/src/parser.rs:1053:                    write!(&mut self.serialization, "{}", host).unwrap();
url/src/parser.rs:1127:    pub fn parse_path_start<'i>(
url/src/parser.rs:1133:        let path_start = self.serialization.len();
url/src/parser.rs:1142:            if !self.serialization.ends_with('/') {
url/src/parser.rs:1143:                self.serialization.push('/');
url/src/parser.rs:1146:                    return self.parse_path(scheme_type, has_host, path_start, remaining);
url/src/parser.rs:1149:            return self.parse_path(scheme_type, has_host, path_start, input);
url/src/parser.rs:1160:            self.serialization.push('/');
url/src/parser.rs:1163:        self.parse_path(scheme_type, has_host, path_start, input)
url/src/parser.rs:1170:        path_start: usize,
url/src/parser.rs:1175:            let segment_start = self.serialization.len();
url/src/parser.rs:1186:                        self.serialization.push(c);
url/src/parser.rs:1194:                        self.serialization.push('/');
url/src/parser.rs:1206:                                self.serialization
url/src/parser.rs:1209:                                self.serialization
url/src/parser.rs:1213:                            self.serialization.extend(utf8_percent_encode(utf8_c, PATH));
url/src/parser.rs:1219:                &self.serialization[segment_start..self.serialization.len() - 1]
url/src/parser.rs:1221:                &self.serialization[segment_start..self.serialization.len()]
url/src/parser.rs:1227:                    debug_assert!(self.serialization.as_bytes()[segment_start - 1] == b'/');
url/src/parser.rs:1228:                    self.serialization.truncate(segment_start);
url/src/parser.rs:1229:                    if self.serialization.ends_with('/')
url/src/parser.rs:1230:                        && Parser::last_slash_can_be_removed(&self.serialization, path_start)
url/src/parser.rs:1232:                        self.serialization.pop();
url/src/parser.rs:1234:                    self.shorten_path(scheme_type, path_start);
url/src/parser.rs:1237:                    if ends_with_slash && !self.serialization.ends_with('/') {
url/src/parser.rs:1238:                        self.serialization.push('/');
url/src/parser.rs:1244:                    self.serialization.truncate(segment_start);
url/src/parser.rs:1245:                    if !self.serialization.ends_with('/') {
url/src/parser.rs:1246:                        self.serialization.push('/');
url/src/parser.rs:1254:                            self.serialization.truncate(segment_start);
url/src/parser.rs:1255:                            self.serialization.push(c);
url/src/parser.rs:1256:                            self.serialization.push(':');
url/src/parser.rs:1258:                                self.serialization.push('/');
url/src/parser.rs:1279:            let path = self.serialization.split_off(path_start);
url/src/parser.rs:1280:            self.serialization.push('/');
url/src/parser.rs:1281:            self.serialization.push_str(path.trim_start_matches('/'));
url/src/parser.rs:1287:    fn last_slash_can_be_removed(serialization: &str, path_start: usize) -> bool {
url/src/parser.rs:1288:        let url_before_segment = &serialization[..serialization.len() - 1];
url/src/parser.rs:1291:            segment_before_start >= path_start
url/src/parser.rs:1293:                && !path_starts_with_windows_drive_letter(&serialization[segment_before_start..])
url/src/parser.rs:1300:    fn shorten_path(&mut self, scheme_type: SchemeType, path_start: usize) {
url/src/parser.rs:1302:        if self.serialization.len() == path_start {
url/src/parser.rs:1307:            && is_normalized_windows_drive_letter(&self.serialization[path_start..])
url/src/parser.rs:1312:        self.pop_path(scheme_type, path_start);
url/src/parser.rs:1316:    fn pop_path(&mut self, scheme_type: SchemeType, path_start: usize) {
url/src/parser.rs:1317:        if self.serialization.len() > path_start {
url/src/parser.rs:1318:            let slash_position = self.serialization[path_start..].rfind('/').unwrap();
url/src/parser.rs:1320:            let segment_start = path_start + slash_position + 1;
url/src/parser.rs:1323:                && is_normalized_windows_drive_letter(&self.serialization[segment_start..]))
url/src/parser.rs:1325:                self.serialization.truncate(segment_start);
url/src/parser.rs:1339:                    self.serialization
url/src/parser.rs:1357:        path_start: u32,
url/src/parser.rs:1363:            serialization: self.serialization,
url/src/parser.rs:1370:            path_start,
url/src/parser.rs:1387:                query_start = Some(to_u32(self.serialization.len())?);
url/src/parser.rs:1388:                self.serialization.push('?');
url/src/parser.rs:1400:        let fragment_start = to_u32(self.serialization.len())?;
url/src/parser.rs:1401:        self.serialization.push('#');
url/src/parser.rs:1425:        let encoding = match &self.serialization[..scheme_end as usize] {
url/src/parser.rs:1439:        self.serialization.extend(percent_encode(&query_bytes, set));
url/src/parser.rs:1446:            None => &*base_url.serialization,
url/src/parser.rs:1448:        debug_assert!(self.serialization.is_empty());
url/src/parser.rs:1449:        self.serialization
url/src/parser.rs:1451:        self.serialization.push_str(before_fragment);
url/src/parser.rs:1452:        self.serialization.push('#');
url/src/parser.rs:1457:            serialization: self.serialization,
url/src/parser.rs:1470:            self.serialization
url/src/parser.rs:1562:fn path_starts_with_windows_drive_letter(s: &str) -> bool {
shell
rg --files
output
Chunk ID: 8c4498
Wall time: 0.0001 seconds
Process exited with code 0
Original token count: 21294
Output:
Total output lines: 879

UPGRADING.md
idna/Cargo.toml
idna/src/make_uts46_mapping_table.py
idna/src/uts46.rs
idna/src/IdnaMappingTable.txt
idna/src/lib.rs
idna/src/punycode.rs
idna/src/uts46_mapping_table.rs
idna/tests/IdnaTestV2.txt
idna/tests/uts46.rs
idna/tests/punycode_tests.json
idna/tests/tests.rs
idna/tests/unit.rs
idna/tests/punycode.rs
idna/benches/all.rs
LICENSE-APACHE
data-url/Cargo.toml
data-url/src/forgiving_base64.rs
data-url/src/mime.rs
data-url/src/lib.rs
data-url/src/make_base64_decode_table.py
data-url/tests/data-urls.json
data-url/tests/generated-mime-types.json
data-url/tests/base64.json
data-url/tests/mime-types.json
data-url/tests/wpt.rs
data-url/README.md
debug_metadata/url.natvis
debug_metadata/README.md
url/Cargo.toml
url/src/host.rs
url/src/slicing.rs
url/src/origin.rs
url/src/quirks.rs
url/src/lib.rs
url/src/path_segments.rs
url/src/parser.rs
url/tests/data.rs
url/tests/setters_tests.json
url/tests/urltestdata.json
url/tests/unit.rs
url/tests/debugger_visualizer.rs
url/benches/parse_url.rs
url/fuzz/Cargo.toml
url/fuzz/fuzz_targets/parse.rs
deny.toml
LICENSE-MIT
form_urlencoded/LICENSE-APACHE
form_urlencoded/LICENSE-MIT
form_urlencoded/Cargo.toml
form_urlencoded/src/lib.rs
SECURITY.md
Cargo.lock
percent_encoding/Cargo.toml
percent_encoding/src/lib.rs
Cargo.toml
README.md
target/debug/libpercent_encoding.rlib
target/debug/liburl.rlib
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm.lock
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/8gogjfidpjzej9k6cuay2faf8.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/7ut7t8re1b826btusc5cl4v2x.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/agj3f7qghevfxfr23sr28wexi.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/a15dh6016y9308jgv5e47riq3.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/1kxqi2cpw1wo5d2dnndxvf6q3.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/e4mnmm3s16tqamgbh0pqntiok.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/91l4rjlvxicdixq97uw7o70v7.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/02xsfoa6kzjvu1nw0xxho3nlc.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/czcyo95aiasa68gs2u0oxokxg.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/biwxx8v5me9yij2twxhq1ogap.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/bykpo9u62mbxeguwentguhvb0.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3aei1d9abwc04gi9rd1cvlj2z.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/46oe1q2uzd5akxevv3r99fzip.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3t3b1o26rvpnv84xk4nmojy1e.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/deq16zjekzu8qul67ogjv8y31.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9q2hld4yimftwjnk562e1bqew.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/2s6f3kdxqpgxfxyn1rc4xddur.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/dep-graph.bin
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/2775hsj8wkvgpksif3rqwm63w.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9tkdo65ae4h7m9v8v0ats5of2.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/agq6p4fnfvqm77rbelsw0i4j6.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/work-products.bin
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/5v2gape4c61vc1ddu1kmo158v.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/28zb8h3ry0uxso7421eb3nt2k.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/epqw3gouk3odnxiuj1jo6hldl.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/bowd06t3jgepd1eidi3j9o54c.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/eekib1ye0fmfgef6oigd601yv.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9whyp654sppd8k0rv4m5xmp82.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/01n2rtdvib90e2jsthfw51efv.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/900gb2yw76l4nrjafed0vh42m.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/a4enno5fp9euzckooxod3npn4.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/eczojs28z19hh99k6eb0g5j04.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3soable5b906do9pka3x2j9ur.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9g6iwsh5jtq52d8cdlz8yh4d1.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3k910szc0dn0ty4qgva8y2qq8.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/4shhir26nlxxq5pss0w47by52.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/258jnbd9zwu7ew57q7u0253aq.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/cnhr8x0pnp7ugoh3ko1u8qs45.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/ee5cxl6a6evr6lsdy0cpxedow.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3sebt2r12dsn1uk781qs3rnhj.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/bvlmdykgj4xwvt127xupf70rc.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9phsq551fyex9j1tmbwzj74vr.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/502vo5unbup48b7ifgx6kehad.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/8rohcv8v1088qjcgbuymfy91d.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/0jbs3vebrmgnlpwe60ls7p9uz.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9b7c6cf9hhtirf46fm6ecyjza.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/amkb38yht8dmwu1xgq03mti1h.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/de3ip26i8gt65m5od9658kn7r.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/2at9epbxsgpyahlfumu7gjq9i.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/899ugj7od0x8px3v3ujykw1p6.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/83ku5vaflgndgid98zhn9tawa.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/5ajzztpqhrapukd0uwkqipsna.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/1fn1lz061zk82vsndz5wj90o3.o
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target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/1mqw1yppynw397arbfl65hnkc.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/1ngss9k430ri6t12wx4v9zvcv.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/c7q5qfhogfqcw1j47ilyzo29x.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/csq4p3al5mzznuslat36pej80.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/a801ynq5m11ijqsdjkejvnu0s.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/98ekh76ol0t5gco2kc98r1jcy.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/bva2kc5y142ksiw58kco1di5h.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/cdzafb4i2ma0gvcjzdxxuifs2.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/6dty9q33gde7ehdujwsipdfj4.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/84sswellw3rrji8t4na9w2sdz.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/bgdylkdpa0do687xtaeak4iyx.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/dadh94qizpyp8wrvsgtcggzlp.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/query-cache.bin
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3e03aiigsd27mupc64rh449kt.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/d4la7jajgpuc26d6ovpq23u1i.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/2ngb3hc1z6qtb06dq5cf3b3gd.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/4meummhxone2t5amg7j24wr07.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3en08tqxbksbxhaswgqi0sx28.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/9jih05jud875hiz8en3na0y9j.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/dw4jde1xo1n0w2xa4jntnkut0.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/99lgqd3gkfdf8sehcdf25lcgr.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/6thfx2yz1zd3kkquq26m5mo9s.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/86qduwl8ldk65mozdb3lwi113.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3clpzgo1jabo9s68qdd232jqb.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/4wxyd8q63l2nsrutm7rkca580.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/77wc4bkdzcxbswmtmuaeya94v.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/6m027519o46e4nno9lrqokkpz.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/7gyyqs9cor3i9yfyf4poizv7a.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/3r59joa5o2hnz85fgblg17ylz.o
target/debug/incremental/unit-1rtx6ttyceut6/s-hjou0rzxf7-0gprirm-8mmu68kplntmgv5jkthjsnd6n/6adv5em2rxewf6n5fqd8d7m9d.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/dep-graph.bin
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/3sfk52cnzdq3lqldqdla1qavt.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/work-products.bin
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/8ilh8nwuzeqny6ljn8jbw2i8k.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/4l1vm0j7jhztplafysuoeo49c.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/5fd3u3mwmlmcw5h6ml7cnji74.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/cz3povjitv5meffkbljpcs39v.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/query-cache.bin
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r-0i4hmo3dzf6r3t8anyfcx7eg7/7nwf44ir5vg1i4bia652z894r.o
target/debug/incremental/url-3624ita5ju63y/s-hjou0ruvk4-1a7xc8r.lock
target/debug/incremental/unit-31a5kslhf18xu/s-hjou0rfi84-1h7v417-dxiy9q2gpkp9di0h18y73gfd7/7cf9q8hxgewy7fxi1c17o9i05.o
target/debug/incremental/unit-31a5kslhf18xu/s-hjou0rfi84-1h7v417-dxiy9q2gpkp9di0h18y73gfd7/9phx5yraspeaqwxoti1fgnsrn.o
target/debug/incremental/unit-31a5kslhf18xu/s-hjou0rfi84-1h7v417-dxiy9q2gpkp9di0h18y73gfd7/04o9cgx8g2kz956ty9tpsgryb.o
target/debug/incremental/unit-31a5kslhf18xu/s-hjou0rfi84-1h7v417-dxiy9q2gpkp9di0h18y73gfd7/5xo60wnqxg5d0zouu0oozzgbk.o
target/debug/incremental/unit-31a5kslhf18xu/s-hjou0rfi84-1h7v417-dxiy9q2gpkp9di0h18y73gfd7/cb9bhzmp64hcwz0i5a2gb7ljo.o
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shell
git status --short
output
Chunk ID: 10fb0d
Wall time: 0.0000 seconds
Process exited with code 128
Original token count: 18
Output:
fatal: not a git repository (or any of the parent directories): .git
The workspace is not a Git checkout, so I’ll track edits directly. I found the core shape: `Url` stores a single serialization plus offsets, so the fix likely needs one small invariant for the serialized `/.` marker and offset-aware accessors.
shell
sed -n '160,230p' url/src/lib.rs
output
Chunk ID: e8f432
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 607
Output:
mod origin;
mod parser;
mod path_segments;
mod slicing;

#[doc(hidden)]
pub mod quirks;

/// A parsed URL record.
#[derive(Clone)]
pub struct Url {
    /// Syntax in pseudo-BNF:
    ///
    ///   url = scheme ":" [ hierarchical | non-hierarchical ] [ "?" query ]? [ "#" fragment ]?
    ///   non-hierarchical = non-hierarchical-path
    ///   non-hierarchical-path = /* Does not start with "/" */
    ///   hierarchical = authority? hierarchical-path
    ///   authority = "//" userinfo? host [ ":" port ]?
    ///   userinfo = username [ ":" password ]? "@"
    ///   hierarchical-path = [ "/" path-segment ]+
    serialization: String,

    // Components
    scheme_end: u32,  // Before ':'
    username_end: u32, // Before ':' (if a password is given) or '@' (if not)
    host_start: u32,
    host_end: u32,
    host: HostInternal,
    port: Option<u16>,
    path_start: u32,            // Before initial '/', if any
    query_start: Option<u32>,   // Before '?', unlike Position::QueryStart
    fragment_start: Option<u32>, // Before '#', unlike Position::FragmentStart
}

/// Full configuration for the URL parser.
#[derive(Copy, Clone)]
pub struct ParseOptions<'a> {
    base_url: Option<&'a Url>,
    encoding_override: EncodingOverride<'a>,
    violation_fn: Option<&'a dyn Fn(SyntaxViolation)>,
}

impl<'a> ParseOptions<'a> {
    /// Change the base URL
    pub fn base_url(mut self, new: Option<&'a Url>) -> Self {
        self.base_url = new;
        self
    }

    /// Override the character encoding of query strings.
    /// This is a legacy concept only relevant for HTML.
    pub fn encoding_override(mut self, new: EncodingOverride<'a>) -> Self {
        self.encoding_override = new;
        self
    }

    /// Call the provided function or closure for a non-fatal `SyntaxViolation`
    /// when it occurs during parsing. Note that since the provided function is
    /// `Fn`, the caller might need to utilize _interior mutability_, such as with
    /// a `RefCell`, to collect the violations.
    ///
    /// ## Example
    /// ```
    /// use std::cell::RefCell;
    /// use url::{Url, SyntaxViolation};
    /// # use url::ParseError;
    /// # fn run() -> Result<(), url::ParseError> {
    /// let violations = RefCell::new(Vec::new());
    /// let url = Url::options()
    ///     .syntax_violation_callback(Some(&|v| violations.borrow_mut().push(v)))
    ///     .parse("https:////example.com")?;
shell
sed -n '600,720p' url/src/lib.rs
output
Chunk ID: 086960
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1275
Output:
    /// This is for testing rust-url itself.
    #[doc(hidden)]
    pub fn check_invariants(&self) -> Result<(), String> {
        macro_rules! assert {
            ($x: expr) => {
                if !$x {
                    return Err(format!(
                        "!( {} ) for URL {:?}",
                        stringify!($x),
                        self.serialization
                    ));
                }
            };
        }

        macro_rules! assert_eq {
            ($a: expr, $b: expr) => {
                {
                    let a = $a;
                    let b = $b;
                    if a != b {
                        return Err(format!("{:?} != {:?} ({} != {}) for URL {:?}",
                                           a, b, stringify!($a), stringify!($b),
                                           self.serialization))
                    }
                }
            }
        }

        assert!(self.scheme_end >= 1);
        assert!(self.byte_at(0).is_ascii_alphabetic());
        assert!(self
            .slice(1..self.scheme_end)
            .chars()
            .all(|c| matches!(c, 'a'..='z' | 'A'..='Z' | '0'..='9' | '+' | '-' | '.')));
        assert_eq!(self.byte_at(self.scheme_end), b':');

        if self.slice(self.scheme_end + 1..).starts_with("//") {
            // URL with authority
            if self.username_end != self.serialization.len() as u32 {
                match self.byte_at(self.username_end) {
                    b':' => {
                        assert!(self.host_start >= self.username_end + 2);
                        assert_eq!(self.byte_at(self.host_start - 1), b'@');
                    }
                    b'@' => assert!(self.host_start == self.username_end + 1),
                    _ => assert_eq!(self.username_end, self.scheme_end + 3),
                }
            }
            assert!(self.host_start >= self.username_end);
            assert!(self.host_end >= self.host_start);
            let host_str = self.slice(self.host_start..self.host_end);
            match self.host {
                HostInternal::None => assert_eq!(host_str, ""),
                HostInternal::Ipv4(address) => assert_eq!(host_str, address.to_string()),
                HostInternal::Ipv6(address) => {
                    let h: Host<String> = Host::Ipv6(address);
                    assert_eq!(host_str, h.to_string())
                }
                HostInternal::Domain => {
                    if SchemeType::from(self.scheme()).is_special() {
                        assert!(!host_str.is_empty())
                    }
                }
            }
            if self.path_start == self.host_end {
                assert_eq!(self.port, None);
            } else {
                assert_eq!(self.byte_at(self.host_end), b':');
                let port_str = self.slice(self.host_end + 1..self.path_start);
                assert_eq!(
                    self.port,
                    Some(port_str.parse::<u16>().expect("Couldn't parse port?"))
                );
            }
            assert!(
                self.path_start as usize == self.serialization.len()
                    || matches!(self.byte_at(self.path_start), b'/' | b'#' | b'?')
            );
        } else {
            // Anarchist URL (no authority)
            assert_eq!(self.username_end, self.scheme_end + 1);
            assert_eq!(self.host_start, self.scheme_end + 1);
            assert_eq!(self.host_end, self.scheme_end + 1);
            assert_eq!(self.host, HostInternal::None);
            assert_eq!(self.port, None);
            assert_eq!(self.path_start, self.scheme_end + 1);
        }
        if let Some(start) = self.query_start {
            assert!(start >= self.path_start);
            assert_eq!(self.byte_at(start), b'?');
        }
        if let Some(start) = self.fragment_start {
            assert!(start >= self.path_start);
            assert_eq!(self.byte_at(start), b'#');
        }
        if let (Some(query_start), Some(fragment_start)) = (self.query_start, self.fragment_start) {
            assert!(fragment_start > query_start);
        }

        let other = Url::parse(self.as_str()).expect("Failed to parse myself?");
        assert_eq!(&self.serialization, &other.serialization);
        assert_eq!(self.scheme_end, other.scheme_end);
        assert_eq!(self.username_end, other.username_end);
        assert_eq!(self.host_start, other.host_start);
        assert_eq!(self.host_end, other.host_end);
        assert!(
            self.host == other.host ||
                // XXX No host round-trips to empty host.
                // See https://[code-host]/whatwg/url/issues/79
                (self.host_str(), other.host_str()) == (None, Some(""))
        );
        assert_eq!(self.port, other.port);
        assert_eq!(self.path_start, other.path_start);
        assert_eq!(self.query_start, other.query_start);
        assert_eq!(self.fragment_start, other.fragment_start);
        Ok(())
    }

    /// Return the origin of this URL (<https://url.spec.whatwg.org/#origin>)
    ///
shell
sed -n '1220,1295p' url/src/lib.rs
output
Chunk ID: a7e9ef
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 727
Output:
        //
        // > This RFC proposes that *all* type parameters are considered in scope
        // > for `impl Trait` in return position

        fn io_result<T>(opt: Option<T>, message: &str) -> io::Result<T> {
            opt.ok_or_else(|| io::Error::new(io::ErrorKind::InvalidData, message))
        }

        let host = io_result(self.host(), "No host name in the URL")?;
        let port = io_result(
            self.port_or_known_default().or_else(default_port_number),
            "No port number in the URL",
        )?;
        Ok(match host {
            Host::Domain(domain) => (domain, port).to_socket_addrs()?.collect(),
            Host::Ipv4(ip) => vec![(ip, port).into()],
            Host::Ipv6(ip) => vec![(ip, port).into()],
        })
    }

    /// Return the path for this URL, as a percent-encoded ASCII string.
    /// For cannot-be-a-base URLs, this is an arbitrary string that doesn’t start with '/'.
    /// For other URLs, this starts with a '/' slash
    /// and continues with slash-separated path segments.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("https://example.com/api/versions?page=2")?;
    /// assert_eq!(url.path(), "/api/versions");
    ///
    /// let url = Url::parse("https://example.com")?;
    /// assert_eq!(url.path(), "/");
    ///
    /// let url = Url::parse("https://example.com/countries/việt nam")?;
    /// assert_eq!(url.path(), "/countries/vi%E1%BB%87t%20nam");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn path(&self) -> &str {
        match (self.query_start, self.fragment_start) {
            (None, None) => self.slice(self.path_start..),
            (Some(next_component_start), _) | (None, Some(next_component_start)) => {
                self.slice(self.path_start..next_component_start)
            }
        }
    }

    /// Unless this URL is cannot-be-a-base,
    /// return an iterator of '/' slash-separated path segments,
    /// each as a percent-encoded ASCII string.
    ///
    /// Return `None` for cannot-be-a-base URLs.
    ///
    /// When `Some` is returned, the iterator always contains at least one string
    /// (which may be empty).
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use std::error::Error;
    ///
    /// # fn run() -> Result<(), Box<dyn Error>> {
    /// let url = Url::parse("https://example.com/foo/bar")?;
    /// let mut path_segments = url.path_segments().ok_or_else(|| "cannot be base")?;
    /// assert_eq!(path_segments.next(), Some("foo"));
    /// assert_eq!(path_segments.next(), Some("bar"));
    /// assert_eq!(path_segments.next(), None);
    ///
    /// let url = Url::parse("https://example.com")?;
    /// let mut path_segments = url.path_segments().ok_or_else(|| "cannot be base")?;
shell
sed -n '80,170p' url/src/slicing.rs
output
Chunk ID: aa4fea
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 753
Output:
#[derive(Copy, Clone, Debug)]
pub enum Position {
    BeforeScheme,
    AfterScheme,
    BeforeUsername,
    AfterUsername,
    BeforePassword,
    AfterPassword,
    BeforeHost,
    AfterHost,
    BeforePort,
    AfterPort,
    BeforePath,
    AfterPath,
    BeforeQuery,
    AfterQuery,
    BeforeFragment,
    AfterFragment,
}

impl Url {
    #[inline]
    fn index(&self, position: Position) -> usize {
        match position {
            Position::BeforeScheme => 0,

            Position::AfterScheme => self.scheme_end as usize,

            Position::BeforeUsername => {
                if self.has_authority() {
                    self.scheme_end as usize + "://".len()
                } else {
                    debug_assert!(self.byte_at(self.scheme_end) == b':');
                    debug_assert!(self.scheme_end + ":".len() as u32 == self.username_end);
                    self.scheme_end as usize + ":".len()
                }
            }

            Position::AfterUsername => self.username_end as usize,

            Position::BeforePassword => {
                if self.has_authority() && self.byte_at(self.username_end) == b':' {
                    self.username_end as usize + ":".len()
                } else {
                    debug_assert!(self.username_end == self.host_start);
                    self.username_end as usize
                }
            }

            Position::AfterPassword => {
                if self.has_authority() && self.byte_at(self.username_end) == b':' {
                    debug_assert!(self.byte_at(self.host_start - "@".len() as u32) == b'@');
                    self.host_start as usize - "@".len()
                } else {
                    debug_assert!(self.username_end == self.host_start);
                    self.host_start as usize
                }
            }

            Position::BeforeHost => self.host_start as usize,

            Position::AfterHost => self.host_end as usize,

            Position::BeforePort => {
                if self.port.is_some() {
                    debug_assert!(self.byte_at(self.host_end) == b':');
                    self.host_end as usize + ":".len()
                } else {
                    self.host_end as usize
                }
            }

            Position::AfterPort => self.path_start as usize,

            Position::BeforePath => self.path_start as usize,

            Position::AfterPath => match (self.query_start, self.fragment_start) {
                (Some(q), _) => q as usize,
                (None, Some(f)) => f as usize,
                (None, None) => self.serialization.len(),
            },

            Position::BeforeQuery => match (self.query_start, self.fragment_start) {
                (Some(q), _) => {
                    debug_assert!(self.byte_at(q) == b'?');
                    q as usize + "?".len()
                }
                (None, Some(f)) => f as usize,
                (None, None) => self.serialization.len(),
            },

shell
sed -n '450,505p' url/src/parser.rs
output
Chunk ID: ebe2e2
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 464
Output:
                        != "//"
                });
                self.after_double_slash(remaining, scheme_type, scheme_end)
            }
            SchemeType::NotSpecial => self.parse_non_special(input, scheme_type, scheme_end),
        }
    }

    /// Scheme other than file, http, https, ws, ws, ftp.
    fn parse_non_special(
        mut self,
        input: Input<'_>,
        scheme_type: SchemeType,
        scheme_end: u32,
    ) -> ParseResult<Url> {
        // path or authority state (
        if let Some(input) = input.split_prefix("//") {
            return self.after_double_slash(input, scheme_type, scheme_end);
        }
        // Anarchist URL (no authority)
        let path_start = to_u32(self.serialization.len())?;
        let username_end = path_start;
        let host_start = path_start;
        let host_end = path_start;
        let host = HostInternal::None;
        let port = None;
        let remaining = if let Some(input) = input.split_prefix('/') {
            let path_start = self.serialization.len();
            self.serialization.push('/');
            self.parse_path(scheme_type, &mut false, path_start, input)
        } else {
            self.parse_cannot_be_a_base_path(input)
        };
        self.with_query_and_fragment(
            scheme_type,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            remaining,
        )
    }

    fn parse_file(
        mut self,
        input: Input<'_>,
        scheme_type: SchemeType,
        base_file_url: Option<&Url>,
    ) -> ParseResult<Url> {
        use crate::SyntaxViolation::Backslash;
        // file state
        debug_assert!(self.serialization.is_empty());
        let (first_char, input_after_first_char) = input.split_first();
shell
sed -n '707,825p' url/src/parser.rs
output
Chunk ID: b959dd
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1321
Output:
    fn parse_relative(
        mut self,
        input: Input<'_>,
        scheme_type: SchemeType,
        base_url: &Url,
    ) -> ParseResult<Url> {
        // relative state
        debug_assert!(self.serialization.is_empty());
        let (first_char, input_after_first_char) = input.split_first();
        match first_char {
            None => {
                // Copy everything except the fragment
                let before_fragment = match base_url.fragment_start {
                    Some(i) => &base_url.serialization[..i as usize],
                    None => &*base_url.serialization,
                };
                self.serialization.push_str(before_fragment);
                Ok(Url {
                    serialization: self.serialization,
                    fragment_start: None,
                    ..*base_url
                })
            }
            Some('?') => {
                // Copy everything up to the query string
                let before_query = match (base_url.query_start, base_url.fragment_start) {
                    (None, None) => &*base_url.serialization,
                    (Some(i), _) | (None, Some(i)) => base_url.slice(..i),
                };
                self.serialization.push_str(before_query);
                let (query_start, fragment_start) =
                    self.parse_query_and_fragment(scheme_type, base_url.scheme_end, input)?;
                Ok(Url {
                    serialization: self.serialization,
                    query_start,
                    fragment_start,
                    ..*base_url
                })
            }
            Some('#') => self.fragment_only(base_url, input),
            Some('/') | Some('\\') => {
                let (slashes_count, remaining) = input.count_matching(|c| matches!(c, '/' | '\\'));
                if slashes_count >= 2 {
                    self.log_violation_if(SyntaxViolation::ExpectedDoubleSlash, || {
                        input
                            .clone()
                            .take_while(|&c| matches!(c, '/' | '\\'))
                            .collect::<String>()
                            != "//"
                    });
                    let scheme_end = base_url.scheme_end;
                    debug_assert!(base_url.byte_at(scheme_end) == b':');
                    self.serialization
                        .push_str(base_url.slice(..scheme_end + 1));
                    if let Some(after_prefix) = input.split_prefix("//") {
                        return self.after_double_slash(after_prefix, scheme_type, scheme_end);
                    }
                    return self.after_double_slash(remaining, scheme_type, scheme_end);
                }
                let path_start = base_url.path_start;
                self.serialization.push_str(base_url.slice(..path_start));
                self.serialization.push('/');
                let remaining = self.parse_path(
                    scheme_type,
                    &mut true,
                    path_start as usize,
                    input_after_first_char,
                );
                self.with_query_and_fragment(
                    scheme_type,
                    base_url.scheme_end,
                    base_url.username_end,
                    base_url.host_start,
                    base_url.host_end,
                    base_url.host,
                    base_url.port,
                    base_url.path_start,
                    remaining,
                )
            }
            _ => {
                let before_query = match (base_url.query_start, base_url.fragment_start) {
                    (None, None) => &*base_url.serialization,
                    (Some(i), _) | (None, Some(i)) => base_url.slice(..i),
                };
                self.serialization.push_str(before_query);
                // FIXME spec says just "remove last entry", not the "pop" algorithm
                self.pop_path(scheme_type, base_url.path_start as usize);
                // A special url always has a path.
                // A path always starts with '/'
                if self.serialization.len() == base_url.path_start as usize
                    && (SchemeType::from(base_url.scheme()).is_special() || !input.is_empty())
                {
                    self.serialization.push('/');
                }
                let remaining = match input.split_first() {
                    (Some('/'), remaining) => self.parse_path(
                        scheme_type,
                        &mut true,
                        base_url.path_start as usize,
                        remaining,
                    ),
                    _ => {
                        self.parse_path(scheme_type, &mut true, base_url.path_start as usize, input)
                    }
                };
                self.with_query_and_fragment(
                    scheme_type,
                    base_url.scheme_end,
                    base_url.username_end,
                    base_url.host_start,
                    base_url.host_end,
                    base_url.host,
                    base_url.port,
                    base_url.path_start,
                    remaining,
                )
            }
        }
shell
sed -n '1120,1290p' url/src/parser.rs
output
Chunk ID: d892ed
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1964
Output:
        let mut opt_port = Some(port as u16);
        if !has_any_digit || opt_port == default_port() {
            opt_port = None;
        }
        Ok((opt_port, input))
    }

    pub fn parse_path_start<'i>(
        &mut self,
        scheme_type: SchemeType,
        has_host: &mut bool,
        input: Input<'i>,
    ) -> Input<'i> {
        let path_start = self.serialization.len();
        let (maybe_c, remaining) = input.split_first();
        // If url is special, then:
        if scheme_type.is_special() {
            if maybe_c == Some('\\') {
                // If c is U+005C (\), validation error.
                self.log_violation(SyntaxViolation::Backslash);
            }
            // A special URL always has a non-empty path.
            if !self.serialization.ends_with('/') {
                self.serialization.push('/');
                // We have already made sure the forward slash is present.
                if maybe_c == Some('/') || maybe_c == Some('\\') {
                    return self.parse_path(scheme_type, has_host, path_start, remaining);
                }
            }
            return self.parse_path(scheme_type, has_host, path_start, input);
        } else if maybe_c == Some('?') || maybe_c == Some('#') {
            // Otherwise, if state override is not given and c is U+003F (?),
            // set url’s query to the empty string and state to query state.
            // Otherwise, if state override is not given and c is U+0023 (#),
            // set url’s fragment to the empty string and state to fragment state.
            // The query and path states will be handled by the caller.
            return input;
        }

        if maybe_c.is_some() && maybe_c != Some('/') {
            self.serialization.push('/');
        }
        // Otherwise, if c is not the EOF code point:
        self.parse_path(scheme_type, has_host, path_start, input)
    }

    pub fn parse_path<'i>(
        &mut self,
        scheme_type: SchemeType,
        has_host: &mut bool,
        path_start: usize,
        mut input: Input<'i>,
    ) -> Input<'i> {
        // Relative path state
        loop {
            let segment_start = self.serialization.len();
            let mut ends_with_slash = false;
            loop {
                let input_before_c = input.clone();
                let (c, utf8_c) = if let Some(x) = input.next_utf8() {
                    x
                } else {
                    break;
                };
                match c {
                    '/' if self.context != Context::PathSegmentSetter => {
                        self.serialization.push(c);
                        ends_with_slash = true;
                        break;
                    }
                    '\\' if self.context != Context::PathSegmentSetter
                        && scheme_type.is_special() =>
                    {
                        self.log_violation(SyntaxViolation::Backslash);
                        self.serialization.push('/');
                        ends_with_slash = true;
                        break;
                    }
                    '?' | '#' if self.context == Context::UrlParser => {
                        input = input_before_c;
                        break;
                    }
                    _ => {
                        self.check_url_code_point(c, &input);
                        if self.context == Context::PathSegmentSetter {
                            if scheme_type.is_special() {
                                self.serialization
                                    .extend(utf8_percent_encode(utf8_c, SPECIAL_PATH_SEGMENT));
                            } else {
                                self.serialization
                                    .extend(utf8_percent_encode(utf8_c, PATH_SEGMENT));
                            }
                        } else {
                            self.serialization.extend(utf8_percent_encode(utf8_c, PATH));
                        }
                    }
                }
            }
            let segment_before_slash = if ends_with_slash {
                &self.serialization[segment_start..self.serialization.len() - 1]
            } else {
                &self.serialization[segment_start..self.serialization.len()]
            };
            match segment_before_slash {
                // If buffer is a double-dot path segment, shorten url’s path,
                ".." | "%2e%2e" | "%2e%2E" | "%2E%2e" | "%2E%2E" | "%2e." | "%2E." | ".%2e"
                | ".%2E" => {
                    debug_assert!(self.serialization.as_bytes()[segment_start - 1] == b'/');
                    self.serialization.truncate(segment_start);
                    if self.serialization.ends_with('/')
                        && Parser::last_slash_can_be_removed(&self.serialization, path_start)
                    {
                        self.serialization.pop();
                    }
                    self.shorten_path(scheme_type, path_start);

                    // and then if neither c is U+002F (/), nor url is special and c is U+005C (\), append the empty string to url’s path.
                    if ends_with_slash && !self.serialization.ends_with('/') {
                        self.serialization.push('/');
                    }
                }
                // Otherwise, if buffer is a single-dot path segment and if neither c is U+002F (/),
                // nor url is special and c is U+005C (\), append the empty string to url’s path.
                "." | "%2e" | "%2E" => {
                    self.serialization.truncate(segment_start);
                    if !self.serialization.ends_with('/') {
                        self.serialization.push('/');
                    }
                }
                _ => {
                    // If url’s scheme is "file", url’s path is empty, and buffer is a Windows drive letter, then
                    if scheme_type.is_file() && is_windows_drive_letter(segment_before_slash) {
                        // Replace the second code point in buffer with U+003A (:).
                        if let Some(c) = segment_before_slash.chars().next() {
                            self.serialization.truncate(segment_start);
                            self.serialization.push(c);
                            self.serialization.push(':');
                            if ends_with_slash {
                                self.serialization.push('/');
                            }
                        }
                        // If url’s host is neither the empty string nor null,
                        // validation error, set url’s host to the empty string.
                        if *has_host {
                            self.log_violation(SyntaxViolation::FileWithHostAndWindowsDrive);
                            *has_host = false; // FIXME account for this in callers
                        }
                    }
                }
            }
            if !ends_with_slash {
                break;
            }
        }
        if scheme_type.is_file() {
            // while url’s path’s size is greater than 1
            // and url’s path[0] is the empty string,
            // validation error, remove the first item from url’s path.
            //FIXME: log violation
            let path = self.serialization.split_off(path_start);
            self.serialization.push('/');
            self.serialization.push_str(path.trim_start_matches('/'));
        }

        input
    }

    fn last_slash_can_be_removed(serialization: &str, path_start: usize) -> bool {
        let url_before_segment = &serialization[..serialization.len() - 1];
        if let Some(segment_before_start) = url_before_segment.rfind('/') {
            // Do not remove the root slash
shell
sed -n '1330,1410p' url/src/parser.rs
output
Chunk ID: 35c380
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 663
Output:
    pub fn parse_cannot_be_a_base_path<'i>(&mut self, mut input: Input<'i>) -> Input<'i> {
        loop {
            let input_before_c = input.clone();
            match input.next_utf8() {
                Some(('?', _)) | Some(('#', _)) if self.context == Context::UrlParser => {
                    return input_before_c
                }
                Some((c, utf8_c)) => {
                    self.check_url_code_point(c, &input);
                    self.serialization
                        .extend(utf8_percent_encode(utf8_c, CONTROLS));
                }
                None => return input,
            }
        }
    }

    #[allow(clippy::too_many_arguments)]
    fn with_query_and_fragment(
        mut self,
        scheme_type: SchemeType,
        scheme_end: u32,
        username_end: u32,
        host_start: u32,
        host_end: u32,
        host: HostInternal,
        port: Option<u16>,
        path_start: u32,
        remaining: Input<'_>,
    ) -> ParseResult<Url> {
        let (query_start, fragment_start) =
            self.parse_query_and_fragment(scheme_type, scheme_end, remaining)?;
        Ok(Url {
            serialization: self.serialization,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            query_start,
            fragment_start,
        })
    }

    /// Return (query_start, fragment_start)
    fn parse_query_and_fragment(
        &mut self,
        scheme_type: SchemeType,
        scheme_end: u32,
        mut input: Input<'_>,
    ) -> ParseResult<(Option<u32>, Option<u32>)> {
        let mut query_start = None;
        match input.next() {
            Some('#') => {}
            Some('?') => {
                query_start = Some(to_u32(self.serialization.len())?);
                self.serialization.push('?');
                let remaining = self.parse_query(scheme_type, scheme_end, input);
                if let Some(remaining) = remaining {
                    input = remaining
                } else {
                    return Ok((query_start, None));
                }
            }
            None => return Ok((None, None)),
            _ => panic!("Programming error. parse_query_and_fragment() called without ? or #"),
        }

        let fragment_start = to_u32(self.serialization.len())?;
        self.serialization.push('#');
        self.parse_fragment(input);
        Ok((query_start, Some(fragment_start)))
    }

    pub fn parse_query<'i>(
        &mut self,
        scheme_type: SchemeType,
        scheme_end: u32,
        mut input: Input<'i>,
shell
sed -n '820,875p' url/src/parser.rs
output
Chunk ID: f6176c
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 452
Output:
                    base_url.port,
                    base_url.path_start,
                    remaining,
                )
            }
        }
    }

    fn after_double_slash(
        mut self,
        input: Input<'_>,
        scheme_type: SchemeType,
        scheme_end: u32,
    ) -> ParseResult<Url> {
        self.serialization.push('/');
        self.serialization.push('/');
        // authority state
        let before_authority = self.serialization.len();
        let (username_end, remaining) = self.parse_userinfo(input, scheme_type)?;
        let has_authority = before_authority != self.serialization.len();
        // host state
        let host_start = to_u32(self.serialization.len())?;
        let (host_end, host, port, remaining) =
            self.parse_host_and_port(remaining, scheme_end, scheme_type)?;
        if host == HostInternal::None && has_authority {
            return Err(ParseError::EmptyHost);
        }
        // path state
        let path_start = to_u32(self.serialization.len())?;
        let remaining = self.parse_path_start(scheme_type, &mut true, remaining);
        self.with_query_and_fragment(
            scheme_type,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            remaining,
        )
    }

    /// Return (username_end, remaining)
    fn parse_userinfo<'i>(
        &mut self,
        mut input: Input<'i>,
        scheme_type: SchemeType,
    ) -> ParseResult<(u32, Input<'i>)> {
        let mut last_at = None;
        let mut remaining = input.clone();
        let mut char_count = 0;
        while let Some(c) = remaining.next() {
            match c {
                '@' => {
                    if last_at.is_some() {
shell
sed -n '860,910p' url/src/lib.rs
output
Chunk ID: 4d1686
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 484
Output:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert_eq!(url.authority(), "");
    /// let url = Url::parse("file:///tmp/foo")?;
    /// assert_eq!(url.authority(), "");
    /// let url = Url::parse("https://user:password@example.com/tmp/foo")?;
    /// assert_eq!(url.authority(), "user:password@example.com");
    /// let url = Url::parse("irc://àlex.рф.example.com:6667/foo")?;
    /// assert_eq!(url.authority(), "%C3%A0lex.%D1%80%D1%84.example.com:6667");
    /// let url = Url::parse("http://àlex.рф.example.com:80/foo")?;
    /// assert_eq!(url.authority(), "xn--lex-8ka.xn--p1ai.example.com");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn authority(&self) -> &str {
        let scheme_separator_len = "://".len() as u32;
        if self.has_authority() && self.path_start > self.scheme_end + scheme_separator_len {
            self.slice(self.scheme_end + scheme_separator_len..self.path_start)
        } else {
            ""
        }
    }

    /// Return whether this URL is a cannot-be-a-base URL,
    /// meaning that parsing a relative URL string with this URL as the base will return an error.
    ///
    /// This is the case if the scheme and `:` delimiter are not followed by a `/` slash,
    /// as is typically the case of `data:` and `mailto:` URLs.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert!(!url.cannot_be_a_base());
    ///
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert!(!url.cannot_be_a_base());
    ///
    /// let url = Url::parse("data:text/plain,Stuff")?;
    /// assert!(url.cannot_be_a_base());
    /// # Ok(())
shell
sed -n '1600,1685p' url/src/lib.rs
output
Chunk ID: aaaf4f
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 861
Output:
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/comments");
    /// assert_eq!(url.as_str(), "https://example.com/api/comments");
    /// assert_eq!(url.path(), "/api/comments");
    ///
    /// let mut url = Url::parse("https://example.com/api")?;
    /// url.set_path("data/report.csv");
    /// assert_eq!(url.as_str(), "https://example.com/data/report.csv");
    /// assert_eq!(url.path(), "/data/report.csv");
    ///
    /// // `set_path` percent-encodes the given string if it's not already percent-encoded.
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/some comments");
    /// assert_eq!(url.as_str(), "https://example.com/api/some%20comments");
    /// assert_eq!(url.path(), "/api/some%20comments");
    ///
    /// // `set_path` will not double percent-encode the string if it's already percent-encoded.
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/some%20comments");
    /// assert_eq!(url.as_str(), "https://example.com/api/some%20comments");
    /// assert_eq!(url.path(), "/api/some%20comments");
    ///
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn set_path(&mut self, mut path: &str) {
        let after_path = self.take_after_path();
        let old_after_path_pos = to_u32(self.serialization.len()).unwrap();
        let cannot_be_a_base = self.cannot_be_a_base();
        let scheme_type = SchemeType::from(self.scheme());
        self.serialization.truncate(self.path_start as usize);
        self.mutate(|parser| {
            if cannot_be_a_base {
                if path.starts_with('/') {
                    parser.serialization.push_str("%2F");
                    path = &path[1..];
                }
                parser.parse_cannot_be_a_base_path(parser::Input::new(path));
            } else {
                let mut has_host = true; // FIXME
                parser.parse_path_start(scheme_type, &mut has_host, parser::Input::new(path));
            }
        });
        self.restore_after_path(old_after_path_pos, &after_path);
    }

    /// Return an object with methods to manipulate this URL’s path segments.
    ///
    /// Return `Err(())` if this URL is cannot-be-a-base.
    #[allow(clippy::result_unit_err)]
    pub fn path_segments_mut(&mut self) -> Result<PathSegmentsMut<'_>, ()> {
        if self.cannot_be_a_base() {
            Err(())
        } else {
            Ok(path_segments::new(self))
        }
    }

    fn restore_after_path(&mut self, old_after_path_position: u32, after_path: &str) {
        let new_after_path_position = to_u32(self.serialization.len()).unwrap();
        let adjust = |index: &mut u32| {
            *index -= old_after_path_position;
            *index += new_after_path_position;
        };
        if let Some(ref mut index) = self.query_start {
            adjust(index)
        }
        if let Some(ref mut index) = self.fragment_start {
            adjust(index)
        }
        self.serialization.push_str(after_path)
    }

    /// Change this URL’s port number.
    ///
    /// Note that default port numbers are not reflected in the serialization.
    ///
    /// If this URL is cannot-be-a-base, does not have a host, or has the `file` scheme;
shell
sed -n '1,270p' url/src/path_segments.rs
output
Chunk ID: b9b209
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 2168
Output:
// Copyright 2016 The rust-url developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use crate::parser::{self, to_u32, SchemeType};
use crate::Url;
use std::str;

/// Exposes methods to manipulate the path of an URL that is not cannot-be-base.
///
/// The path always starts with a `/` slash, and is made of slash-separated segments.
/// There is always at least one segment (which may be the empty string).
///
/// Examples:
///
/// ```rust
/// use url::Url;
/// # use std::error::Error;
///
/// # fn run() -> Result<(), Box<dyn Error>> {
/// let mut url = Url::parse("mailto:me@example.com")?;
/// assert!(url.path_segments_mut().is_err());
///
/// let mut url = Url::parse("http://example.net/foo/index.html")?;
/// url.path_segments_mut().map_err(|_| "cannot be base")?
///     .pop().push("img").push("2/100%.png");
/// assert_eq!(url.as_str(), "http://example.net/foo/img/2%2F100%25.png");
/// # Ok(())
/// # }
/// # run().unwrap();
/// ```
#[derive(Debug)]
pub struct PathSegmentsMut<'a> {
    url: &'a mut Url,
    after_first_slash: usize,
    after_path: String,
    old_after_path_position: u32,
}

// Not re-exported outside the crate
pub fn new(url: &mut Url) -> PathSegmentsMut<'_> {
    let after_path = url.take_after_path();
    let old_after_path_position = to_u32(url.serialization.len()).unwrap();
    // Special urls always have a non empty path
    if SchemeType::from(url.scheme()).is_special() {
        debug_assert!(url.byte_at(url.path_start) == b'/');
    } else {
        debug_assert!(
            url.serialization.len() == url.path_start as usize
                || url.byte_at(url.path_start) == b'/'
        );
    }
    PathSegmentsMut {
        after_first_slash: url.path_start as usize + "/".len(),
        url,
        old_after_path_position,
        after_path,
    }
}

impl<'a> Drop for PathSegmentsMut<'a> {
    fn drop(&mut self) {
        self.url
            .restore_after_path(self.old_after_path_position, &self.after_path)
    }
}

impl<'a> PathSegmentsMut<'a> {
    /// Remove all segments in the path, leaving the minimal `url.path() == "/"`.
    ///
    /// Returns `&mut Self` so that method calls can be chained.
    ///
    /// Example:
    ///
    /// ```rust
    /// use url::Url;
    /// # use std::error::Error;
    ///
    /// # fn run() -> Result<(), Box<dyn Error>> {
    /// let mut url = Url::parse("https://[code-host]/servo/rust-url/")?;
    /// url.path_segments_mut().map_err(|_| "cannot be base")?
    ///     .clear().push("logout");
    /// assert_eq!(url.as_str(), "https://[code-host]/logout");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn clear(&mut self) -> &mut Self {
        self.url.serialization.truncate(self.after_first_slash);
        self
    }

    /// Remove the last segment of this URL’s path if it is empty,
    /// except if these was only one segment to begin with.
    ///
    /// In other words, remove one path trailing slash, if any,
    /// unless it is also the initial slash (so this does nothing if `url.path() == "/")`.
    ///
    /// Returns `&mut Self` so that method calls can be chained.
    ///
    /// Example:
    ///
    /// ```rust
    /// use url::Url;
    /// # use std::error::Error;
    ///
    /// # fn run() -> Result<(), Box<dyn Error>> {
    /// let mut url = Url::parse("https://[code-host]/servo/rust-url/")?;
    /// url.path_segments_mut().map_err(|_| "cannot be base")?
    ///     .push("pulls");
    /// assert_eq!(url.as_str(), "https://[code-host]/servo/rust-url//pulls");
    ///
    /// let mut url = Url::parse("https://[code-host]/servo/rust-url/")?;
    /// url.path_segments_mut().map_err(|_| "cannot be base")?
    ///     .pop_if_empty().push("pulls");
    /// assert_eq!(url.as_str(), "https://[code-host]/servo/rust-url/pulls");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn pop_if_empty(&mut self) -> &mut Self {
        if self.after_first_slash >= self.url.serialization.len() {
            return self;
        }
        if self.url.serialization[self.after_first_slash..].ends_with('/') {
            self.url.serialization.pop();
        }
        self
    }

    /// Remove the last segment of this URL’s path.
    ///
    /// If the path only has one segment, make it empty such that `url.path() == "/"`.
    ///
    /// Returns `&mut Self` so that method calls can be chained.
    pub fn pop(&mut self) -> &mut Self {
        if self.after_first_slash >= self.url.serialization.len() {
            return self;
        }
        let last_slash = self.url.serialization[self.after_first_slash..]
            .rfind('/')
            .unwrap_or(0);
        self.url
            .serialization
            .truncate(self.after_first_slash + last_slash);
        self
    }

    /// Append the given segment at the end of this URL’s path.
    ///
    /// See the documentation for `.extend()`.
    ///
    /// Returns `&mut Self` so that method calls can be chained.
    pub fn push(&mut self, segment: &str) -> &mut Self {
        self.extend(Some(segment))
    }

    /// Append each segment from the given iterator at the end of this URL’s path.
    ///
    /// Each segment is percent-encoded like in `Url::parse` or `Url::join`,
    /// except that `%` and `/` characters are also encoded (to `%25` and `%2F`).
    /// This is unlike `Url::parse` where `%` is left as-is in case some of the input
    /// is already percent-encoded, and `/` denotes a path segment separator.)
    ///
    /// Note that, in addition to slashes between new segments,
    /// this always adds a slash between the existing path and the new segments
    /// *except* if the existing path is `"/"`.
    /// If the previous last segment was empty (if the path had a trailing slash)
    /// the path after `.extend()` will contain two consecutive slashes.
    /// If that is undesired, call `.pop_if_empty()` first.
    ///
    /// To obtain a behavior similar to `Url::join`, call `.pop()` unconditionally first.
    ///
    /// Returns `&mut Self` so that method calls can be chained.
    ///
    /// Example:
    ///
    /// ```rust
    /// use url::Url;
    /// # use std::error::Error;
    ///
    /// # fn run() -> Result<(), Box<dyn Error>> {
    /// let mut url = Url::parse("https://[code-host]/")?;
    /// let org = "servo";
    /// let repo = "rust-url";
    /// let issue_number = "188";
    /// url.path_segments_mut().map_err(|_| "cannot be base")?
    ///     .extend(&[org, repo, "issues", issue_number]);
    /// assert_eq!(url.as_str(), "https://[code-host]/servo/rust-url/issues/188");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// In order to make sure that parsing the serialization of an URL gives the same URL,
    /// a segment is ignored if it is `"."` or `".."`:
    ///
    /// ```rust
    /// use url::Url;
    /// # use std::error::Error;
    ///
    /// # fn run() -> Result<(), Box<dyn Error>> {
    /// let mut url = Url::parse("https://[code-host]/servo")?;
    /// url.path_segments_mut().map_err(|_| "cannot be base")?
    ///     .extend(&["..", "rust-url", ".", "pulls"]);
    /// assert_eq!(url.as_str(), "https://[code-host]/servo/rust-url/pulls");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn extend<I>(&mut self, segments: I) -> &mut Self
    where
        I: IntoIterator,
        I::Item: AsRef<str>,
    {
        let scheme_type = SchemeType::from(self.url.scheme());
        let path_start = self.url.path_start as usize;
        self.url.mutate(|parser| {
            parser.context = parser::Context::PathSegmentSetter;
            for segment in segments {
                let segment = segment.as_ref();
                if matches!(segment, "." | "..") {
                    continue;
                }
                if parser.serialization.len() > path_start + 1
                    // Non special url's path might still be empty
                    || parser.serialization.len() == path_start
                {
                    parser.serialization.push('/');
                }
                let mut has_host = true; // FIXME account for this?
                parser.parse_path(
                    scheme_type,
                    &mut has_host,
                    path_start,
                    parser::Input::new(segment),
                );
            }
        });
        self
    }
}
The marker should live in the stored serialization but not in the logical path. I’m checking the exact invariants now, because `path_start` currently does double duty as both “after authority/port” and “before path”; this fix needs those positions to diverge without adding public API.
shell
rg -n "fn has_authority|has_authority\(" url/src/lib.rs url/src/parser.rs url/src/slicing.rs url/src/quirks.rs url/src/path_segments.rs
output
Chunk ID: 02d8dd
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 234
Output:
url/src/lib.rs:831:    /// assert!(url.has_authority());
url/src/lib.rs:834:    /// assert!(!url.has_authority());
url/src/lib.rs:837:    /// assert!(!url.has_authority());
url/src/lib.rs:843:    pub fn has_authority(&self) -> bool {
url/src/lib.rs:882:        if self.has_authority() && self.path_start > self.scheme_end + scheme_separator_len {
url/src/lib.rs:943:        if self.has_authority() && self.username_end > self.scheme_end + scheme_separator_len {
url/src/lib.rs:977:        if self.has_authority()
url/src/lib.rs:1948:        if !self.has_authority() {
url/src/lib.rs:2326:            (new_scheme_type.is_file() && self.has_authority())
url/src/slicing.rs:109:                if self.has_authority() {
url/src/slicing.rs:121:                if self.has_authority() && self.byte_at(self.username_end) == b':' {
url/src/slicing.rs:130:                if self.has_authority() && self.byte_at(self.username_end) == b':' {
shell
sed -n '730,920p' url/src/lib.rs
output
Chunk ID: 7819a0
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1510
Output:
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://example.com/foo")?;
    /// assert_eq!(url.origin(),
    ///            Origin::Tuple("ftp".into(),
    ///                          Host::Domain("example.com".into()),
    ///                          21));
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// URL with `blob` scheme:
    ///
    /// ```rust
    /// use url::{Host, Origin, Url};
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("blob:https://example.com/foo")?;
    /// assert_eq!(url.origin(),
    ///            Origin::Tuple("https".into(),
    ///                          Host::Domain("example.com".into()),
    ///                          443));
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// URL with `file` scheme:
    ///
    /// ```rust
    /// use url::{Host, Origin, Url};
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("file:///tmp/foo")?;
    /// assert!(!url.origin().is_tuple());
    ///
    /// let other_url = Url::parse("file:///tmp/foo")?;
    /// assert!(url.origin() != other_url.origin());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// URL with other scheme:
    ///
    /// ```rust
    /// use url::{Host, Origin, Url};
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("foo:bar")?;
    /// assert!(!url.origin().is_tuple());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[inline]
    pub fn origin(&self) -> Origin {
        origin::url_origin(self)
    }

    /// Return the scheme of this URL, lower-cased, as an ASCII string without the ':' delimiter.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("file:///tmp/foo")?;
    /// assert_eq!(url.scheme(), "file");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[inline]
    pub fn scheme(&self) -> &str {
        self.slice(..self.scheme_end)
    }

    /// Return whether the URL has an 'authority',
    /// which can contain a username, password, host, and port number.
    ///
    /// URLs that do *not* are either path-only like `unix:/run/foo.socket`
    /// or cannot-be-a-base like `data:text/plain,Stuff`.
    ///
    /// See also the `authority` method.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert!(url.has_authority());
    ///
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert!(!url.has_authority());
    ///
    /// let url = Url::parse("data:text/plain,Stuff")?;
    /// assert!(!url.has_authority());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[inline]
    pub fn has_authority(&self) -> bool {
        debug_assert!(self.byte_at(self.scheme_end) == b':');
        self.slice(self.scheme_end..).starts_with("://")
    }

    /// Return the authority of this URL as an ASCII string.
    ///
    /// Non-ASCII domains are punycode-encoded per IDNA if this is the host
    /// of a special URL, or percent encoded for non-special URLs.
    /// IPv6 addresses are given between `[` and `]` brackets.
    /// Ports are omitted if they match the well known port of a special URL.
    ///
    /// Username and password are percent-encoded.
    ///
    /// See also the `has_authority` method.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert_eq!(url.authority(), "");
    /// let url = Url::parse("file:///tmp/foo")?;
    /// assert_eq!(url.authority(), "");
    /// let url = Url::parse("https://user:password@example.com/tmp/foo")?;
    /// assert_eq!(url.authority(), "user:password@example.com");
    /// let url = Url::parse("irc://àlex.рф.example.com:6667/foo")?;
    /// assert_eq!(url.authority(), "%C3%A0lex.%D1%80%D1%84.example.com:6667");
    /// let url = Url::parse("http://àlex.рф.example.com:80/foo")?;
    /// assert_eq!(url.authority(), "xn--lex-8ka.xn--p1ai.example.com");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn authority(&self) -> &str {
        let scheme_separator_len = "://".len() as u32;
        if self.has_authority() && self.path_start > self.scheme_end + scheme_separator_len {
            self.slice(self.scheme_end + scheme_separator_len..self.path_start)
        } else {
            ""
        }
    }

    /// Return whether this URL is a cannot-be-a-base URL,
    /// meaning that parsing a relative URL string with this URL as the base will return an error.
    ///
    /// This is the case if the scheme and `:` delimiter are not followed by a `/` slash,
    /// as is typically the case of `data:` and `mailto:` URLs.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert!(!url.cannot_be_a_base());
    ///
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert!(!url.cannot_be_a_base());
    ///
    /// let url = Url::parse("data:text/plain,Stuff")?;
    /// assert!(url.cannot_be_a_base());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[inline]
    pub fn cannot_be_a_base(&self) -> bool {
        !self.slice(self.scheme_end + 1..).starts_with('/')
    }

    /// Return the username for this URL (typically the empty string)
    /// as a percent-encoded ASCII string.
shell
sed -n '240,360p' url/src/lib.rs
output
Chunk ID: 0763eb
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 849
Output:
        self
    }

    /// Parse an URL string with the configuration so far.
    pub fn parse(self, input: &str) -> Result<Url, crate::ParseError> {
        Parser {
            serialization: String::with_capacity(input.len()),
            base_url: self.base_url,
            query_encoding_override: self.encoding_override,
            violation_fn: self.violation_fn,
            context: Context::UrlParser,
        }
        .parse_url(input)
    }
}

impl Url {
    /// Parse an absolute URL from a string.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("https://example.net")?;
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// # Errors
    ///
    /// If the function can not parse an absolute URL from the given string,
    /// a [`ParseError`] variant will be returned.
    ///
    /// [`ParseError`]: enum.ParseError.html
    #[inline]
    pub fn parse(input: &str) -> Result<Url, crate::ParseError> {
        Url::options().parse(input)
    }

    /// Parse an absolute URL from a string and add params to its query string.
    ///
    /// Existing params are not removed.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse_with_params("https://example.net?dont=clobberme",
    ///                                  &[("lang", "rust"), ("browser", "servo")])?;
    /// assert_eq!("https://example.net/?dont=clobberme&lang=rust&browser=servo", url.as_str());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// # Errors
    ///
    /// If the function can not parse an absolute URL from the given string,
    /// a [`ParseError`] variant will be returned.
    ///
    /// [`ParseError`]: enum.ParseError.html
    #[inline]
    pub fn parse_with_params<I, K, V>(input: &str, iter: I) -> Result<Url, crate::ParseError>
    where
        I: IntoIterator,
        I::Item: Borrow<(K, V)>,
        K: AsRef<str>,
        V: AsRef<str>,
    {
        let mut url = Url::options().parse(input);

        if let Ok(ref mut url) = url {
            url.query_pairs_mut().extend_pairs(iter);
        }

        url
    }

    /// https://url.spec.whatwg.org/#potentially-strip-trailing-spaces-from-an-opaque-path
    fn strip_trailing_spaces_from_opaque_path(&mut self) {
        if !self.cannot_be_a_base() {
            return;
        }

        if self.fragment_start.is_some() {
            return;
        }

        if self.query_start.is_some() {
            return;
        }

        let trailing_space_count = self
            .serialization
            .chars()
            .rev()
            .take_while(|c| *c == ' ')
            .count();

        let start = self.serialization.len() - trailing_space_count;

        self.serialization.truncate(start);
    }

    /// Parse a string as an URL, with this URL as the base URL.
    ///
    /// The inverse of this is [`make_relative`].
    ///
    /// Note: a trailing slash is significant.
    /// Without it, the last path component is considered to be a “file” name
    /// to be removed to get at the “directory” that is used as the base:
    ///
    /// # Examples
    ///
shell
sed -n '230,310p' url/src/path_segments.rs
output
Chunk ID: 5a8fb6
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 135
Output:
                    // Non special url's path might still be empty
                    || parser.serialization.len() == path_start
                {
                    parser.serialization.push('/');
                }
                let mut has_host = true; // FIXME account for this?
                parser.parse_path(
                    scheme_type,
                    &mut has_host,
                    path_start,
                    parser::Input::new(segment),
                );
            }
        });
        self
    }
}
The safest internal shape is: keep `path_start` as the logical path start and derive a private “marker start” when `/.` exists. I’m going to patch callers that mean “path boundary” to use that derived position, and leave path accessors slicing from the logical start.
shell
rg -n "path_start" url/src/lib.rs url/src/parser.rs url/src/slicing.rs url/src/path_segments.rs url/src/quirks.rs
output
Chunk ID: 188b3e
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 2421
Output:
url/src/parser.rs:470:        let path_start = to_u32(self.serialization.len())?;
url/src/parser.rs:471:        let username_end = path_start;
url/src/parser.rs:472:        let host_start = path_start;
url/src/parser.rs:473:        let host_end = path_start;
url/src/parser.rs:477:            let path_start = self.serialization.len();
url/src/parser.rs:479:            self.parse_path(scheme_type, &mut false, path_start, input)
url/src/parser.rs:491:            path_start,
url/src/parser.rs:516:                let (path_start, mut host, remaining) =
url/src/parser.rs:520:                let remaining = if path_start {
url/src/parser.rs:521:                    self.parse_path_start(SchemeType::File, &mut has_host, remaining)
url/src/parser.rs:523:                    let path_start = self.serialization.len();
url/src/parser.rs:525:                    self.parse_path(SchemeType::File, &mut has_host, path_start, remaining)
url/src/parser.rs:546:                    path_start: host_end,
url/src/parser.rs:597:                    path_start: host_end,
url/src/parser.rs:642:                        self.shorten_path(SchemeType::File, base_url.path_start as usize);
url/src/parser.rs:646:                            base_url.path_start as usize,
url/src/parser.rs:657:                            base_url.path_start,
url/src/parser.rs:663:                        let path_start = "file://".len();
url/src/parser.rs:665:                            self.parse_path(SchemeType::File, &mut false, path_start, input);
url/src/parser.rs:668:                        let path_start = path_start as u32;
url/src/parser.rs:672:                            username_end: path_start,
url/src/parser.rs:673:                            host_start: path_start,
url/src/parser.rs:674:                            host_end: path_start,
url/src/parser.rs:677:                            path_start,
url/src/parser.rs:687:            let path_start = "file://".len();
url/src/parser.rs:688:            let remaining = self.parse_path(SchemeType::File, &mut false, path_start, input);
url/src/parser.rs:691:            let path_start = path_start as u32;
url/src/parser.rs:695:                username_end: path_start,
url/src/parser.rs:696:                host_start: path_start,
url/src/parser.rs:697:                host_end: path_start,
url/src/parser.rs:700:                path_start,
url/src/parser.rs:766:                let path_start = base_url.path_start;
url/src/parser.rs:767:                self.serialization.push_str(base_url.slice(..path_start));
url/src/parser.rs:772:                    path_start as usize,
url/src/parser.rs:783:                    base_url.path_start,
url/src/parser.rs:794:                self.pop_path(scheme_type, base_url.path_start as usize);
url/src/parser.rs:797:                if self.serialization.len() == base_url.path_start as usize
url/src/parser.rs:806:                        base_url.path_start as usize,
url/src/parser.rs:810:                        self.parse_path(scheme_type, &mut true, base_url.path_start as usize, input)
url/src/parser.rs:821:                    base_url.path_start,
url/src/parser.rs:848:        let path_start = to_u32(self.serialization.len())?;
url/src/parser.rs:849:        let remaining = self.parse_path_start(scheme_type, &mut true, remaining);
url/src/parser.rs:858:            path_start,
url/src/parser.rs:1127:    pub fn parse_path_start<'i>(
url/src/parser.rs:1133:        let path_start = self.serialization.len();
url/src/parser.rs:1146:                    return self.parse_path(scheme_type, has_host, path_start, remaining);
url/src/parser.rs:1149:            return self.parse_path(scheme_type, has_host, path_start, input);
url/src/parser.rs:1163:        self.parse_path(scheme_type, has_host, path_start, input)
url/src/parser.rs:1170:        path_start: usize,
url/src/parser.rs:1230:                        && Parser::last_slash_can_be_removed(&self.serialization, path_start)
url/src/parser.rs:1234:                    self.shorten_path(scheme_type, path_start);
url/src/parser.rs:1279:            let path = self.serialization.split_off(path_start);
url/src/parser.rs:1287:    fn last_slash_can_be_removed(serialization: &str, path_start: usize) -> bool {
url/src/parser.rs:1291:            segment_before_start >= path_start
url/src/parser.rs:1293:                && !path_starts_with_windows_drive_letter(&serialization[segment_before_start..])
url/src/parser.rs:1300:    fn shorten_path(&mut self, scheme_type: SchemeType, path_start: usize) {
url/src/parser.rs:1302:        if self.serialization.len() == path_start {
url/src/parser.rs:1307:            && is_normalized_windows_drive_letter(&self.serialization[path_start..])
url/src/parser.rs:1312:        self.pop_path(scheme_type, path_start);
url/src/parser.rs:1316:    fn pop_path(&mut self, scheme_type: SchemeType, path_start: usize) {
url/src/parser.rs:1317:        if self.serialization.len() > path_start {
url/src/parser.rs:1318:            let slash_position = self.serialization[path_start..].rfind('/').unwrap();
url/src/parser.rs:1320:            let segment_start = path_start + slash_position + 1;
url/src/parser.rs:1357:        path_start: u32,
url/src/parser.rs:1370:            path_start,
url/src/parser.rs:1562:fn path_starts_with_windows_drive_letter(s: &str) -> bool {
url/src/path_segments.rs:50:        debug_assert!(url.byte_at(url.path_start) == b'/');
url/src/path_segments.rs:53:            url.serialization.len() == url.path_start as usize
url/src/path_segments.rs:54:                || url.byte_at(url.path_start) == b'/'
url/src/path_segments.rs:58:        after_first_slash: url.path_start as usize + "/".len(),
url/src/path_segments.rs:221:        let path_start = self.url.path_start as usize;
url/src/path_segments.rs:229:                if parser.serialization.len() > path_start + 1
url/src/path_segments.rs:231:                    || parser.serialization.len() == path_start
url/src/path_segments.rs:239:                    path_start,
url/src/quirks.rs:23:///      |      |    |          | |   `----------------- path_start
url/src/quirks.rs:37:    pub path_start: u32,
url/src/quirks.rs:54:        path_start: url.path_start,
url/src/lib.rs:189:    path_start: u32,            // Before initial '/', if any
url/src/lib.rs:665:            if self.path_start == self.host_end {
url/src/lib.rs:669:                let port_str = self.slice(self.host_end + 1..self.path_start);
url/src/lib.rs:676:                self.path_start as usize == self.serialization.len()
url/src/lib.rs:677:                    || matches!(self.byte_at(self.path_start), b'/' | b'#' | b'?')
url/src/lib.rs:686:            assert_eq!(self.path_start, self.scheme_end + 1);
url/src/lib.rs:689:            assert!(start >= self.path_start);
url/src/lib.rs:693:            assert!(start >= self.path_start);
url/src/lib.rs:713:        assert_eq!(self.path_start, other.path_start);
url/src/lib.rs:882:        if self.has_authority() && self.path_start > self.scheme_end + scheme_separator_len {
url/src/lib.rs:883:            self.slice(self.scheme_end + scheme_separator_len..self.path_start)
url/src/lib.rs:1265:            (None, None) => self.slice(self.path_start..),
url/src/lib.rs:1267:                self.slice(self.path_start..next_component_start)
url/src/lib.rs:1638:        self.serialization.truncate(self.path_start as usize);
url/src/lib.rs:1648:                parser.parse_path_start(scheme_type, &mut has_host, parser::Input::new(path));
url/src/lib.rs:1759:                    .drain(self.host_end as usize..self.path_start as usize);
url/src/lib.rs:1760:                let offset = self.path_start - self.host_end;
url/src/lib.rs:1761:                self.path_start = self.host_end;
url/src/lib.rs:1771:                let path_and_after = self.slice(self.path_start..).to_owned();
url/src/lib.rs:1774:                let old_path_start = self.path_start;
url/src/lib.rs:1775:                let new_path_start = to_u32(self.serialization.len()).unwrap();
url/src/lib.rs:1776:                self.path_start = new_path_start;
url/src/lib.rs:1778:                    *index -= old_path_start;
url/src/lib.rs:1779:                    *index += new_path_start;
url/src/lib.rs:1909:            } else if self.serialization.len() == self.path_start as usize {
url/src/lib.rs:1913:            debug_assert!(self.byte_at(self.path_start) == b'/');
url/src/lib.rs:1915:            let new_path_start = if scheme_type.is_file() {
url/src/lib.rs:1922:                .drain(new_path_start as usize..self.path_start as usize);
url/src/lib.rs:1923:            let offset = self.path_start - new_path_start;
url/src/lib.rs:1924:            self.path_start = new_path_start;
url/src/lib.rs:1925:            self.username_end = new_path_start;
url/src/lib.rs:1926:            self.host_start = new_path_start;
url/src/lib.rs:1927:            self.host_end = new_path_start;
url/src/lib.rs:1942:            self.path_start
url/src/lib.rs:1973:        adjust(&mut self.path_start);
url/src/lib.rs:2081:            adjust(&mut self.path_start);
url/src/lib.rs:2106:            self.path_start -= offset;
url/src/lib.rs:2194:        adjust(&mut self.path_start);
url/src/lib.rs:2345:        adjust(&mut self.path_start);
url/src/lib.rs:2407:            path_start: host_end,
url/src/lib.rs:2463:            ref path_start,
url/src/lib.rs:2475:            path_start,
url/src/lib.rs:2503:            path_start,
url/src/lib.rs:2515:            path_start,
url/src/slicing.rs:152:            Position::AfterPort => self.path_start as usize,
url/src/slicing.rs:154:            Position::BeforePath => self.path_start as usize,
shell
sed -n '930,1035p' url/src/lib.rs
output
Chunk ID: 88a8c7
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 872
Output:
    /// assert_eq!(url.username(), "rms");
    ///
    /// let url = Url::parse("ftp://:secret123@example.com")?;
    /// assert_eq!(url.username(), "");
    ///
    /// let url = Url::parse("https://example.com")?;
    /// assert_eq!(url.username(), "");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn username(&self) -> &str {
        let scheme_separator_len = "://".len() as u32;
        if self.has_authority() && self.username_end > self.scheme_end + scheme_separator_len {
            self.slice(self.scheme_end + scheme_separator_len..self.username_end)
        } else {
            ""
        }
    }

    /// Return the password for this URL, if any, as a percent-encoded ASCII string.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://rms:secret123@example.com")?;
    /// assert_eq!(url.password(), Some("secret123"));
    ///
    /// let url = Url::parse("ftp://:secret123@example.com")?;
    /// assert_eq!(url.password(), Some("secret123"));
    ///
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert_eq!(url.password(), None);
    ///
    /// let url = Url::parse("https://example.com")?;
    /// assert_eq!(url.password(), None);
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn password(&self) -> Option<&str> {
        // This ':' is not the one marking a port number since a host can not be empty.
        // (Except for file: URLs, which do not have port numbers.)
        if self.has_authority()
            && self.username_end != self.serialization.len() as u32
            && self.byte_at(self.username_end) == b':'
        {
            debug_assert!(self.byte_at(self.host_start - 1) == b'@');
            Some(self.slice(self.username_end + 1..self.host_start - 1))
        } else {
            None
        }
    }

    /// Equivalent to `url.host().is_some()`.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert!(url.has_host());
    ///
    /// let url = Url::parse("unix:/run/foo.socket")?;
    /// assert!(!url.has_host());
    ///
    /// let url = Url::parse("data:text/plain,Stuff")?;
    /// assert!(!url.has_host());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn has_host(&self) -> bool {
        !matches!(self.host, HostInternal::None)
    }

    /// Return the string representation of the host (domain or IP address) for this URL, if any.
    ///
    /// Non-ASCII domains are punycode-encoded per IDNA if this is the host
    /// of a special URL, or percent encoded for non-special URLs.
    /// IPv6 addresses are given between `[` and `]` brackets.
    ///
    /// Cannot-be-a-base URLs (typical of `data:` and `mailto:`) and some `file:` URLs
    /// don’t have a host.
    ///
    /// See also the `host` method.
    ///
    /// # Examples
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("https://127.0.0.1/index.html")?;
    /// assert_eq!(url.host_str(), Some("127.0.0.1"));
    ///
    /// let url = Url::parse("ftp://rms@example.com")?;
    /// assert_eq!(url.host_str(), Some("example.com"));
shell
sed -n '1400,1585p' url/src/lib.rs
output
Chunk ID: 601f0b
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1670
Output:
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let url = Url::parse("https://example.com/data.csv#row=4")?;
    ///
    /// assert_eq!(url.fragment(), Some("row=4"));
    ///
    /// let url = Url::parse("https://example.com/data.csv#cell=4,1-6,2")?;
    ///
    /// assert_eq!(url.fragment(), Some("cell=4,1-6,2"));
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn fragment(&self) -> Option<&str> {
        self.fragment_start.map(|start| {
            debug_assert!(self.byte_at(start) == b'#');
            self.slice(start + 1..)
        })
    }

    fn mutate<F: FnOnce(&mut Parser<'_>) -> R, R>(&mut self, f: F) -> R {
        let mut parser = Parser::for_setter(mem::take(&mut self.serialization));
        let result = f(&mut parser);
        self.serialization = parser.serialization;
        result
    }

    /// Change this URL’s fragment identifier.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.com/data.csv")?;
    /// assert_eq!(url.as_str(), "https://example.com/data.csv");

    /// url.set_fragment(Some("cell=4,1-6,2"));
    /// assert_eq!(url.as_str(), "https://example.com/data.csv#cell=4,1-6,2");
    /// assert_eq!(url.fragment(), Some("cell=4,1-6,2"));
    ///
    /// url.set_fragment(None);
    /// assert_eq!(url.as_str(), "https://example.com/data.csv");
    /// assert!(url.fragment().is_none());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn set_fragment(&mut self, fragment: Option<&str>) {
        // Remove any previous fragment
        if let Some(start) = self.fragment_start {
            debug_assert!(self.byte_at(start) == b'#');
            self.serialization.truncate(start as usize);
        }
        // Write the new one
        if let Some(input) = fragment {
            self.fragment_start = Some(to_u32(self.serialization.len()).unwrap());
            self.serialization.push('#');
            self.mutate(|parser| parser.parse_fragment(parser::Input::no_trim(input)))
        } else {
            self.fragment_start = None;
            self.strip_trailing_spaces_from_opaque_path();
        }
    }

    fn take_fragment(&mut self) -> Option<String> {
        self.fragment_start.take().map(|start| {
            debug_assert!(self.byte_at(start) == b'#');
            let fragment = self.slice(start + 1..).to_owned();
            self.serialization.truncate(start as usize);
            fragment
        })
    }

    fn restore_already_parsed_fragment(&mut self, fragment: Option<String>) {
        if let Some(ref fragment) = fragment {
            assert!(self.fragment_start.is_none());
            self.fragment_start = Some(to_u32(self.serialization.len()).unwrap());
            self.serialization.push('#');
            self.serialization.push_str(fragment);
        }
    }

    /// Change this URL’s query string.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.com/products")?;
    /// assert_eq!(url.as_str(), "https://example.com/products");
    ///
    /// url.set_query(Some("page=2"));
    /// assert_eq!(url.as_str(), "https://example.com/products?page=2");
    /// assert_eq!(url.query(), Some("page=2"));
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    pub fn set_query(&mut self, query: Option<&str>) {
        let fragment = self.take_fragment();

        // Remove any previous query
        if let Some(start) = self.query_start.take() {
            debug_assert!(self.byte_at(start) == b'?');
            self.serialization.truncate(start as usize);
        }
        // Write the new query, if any
        if let Some(input) = query {
            self.query_start = Some(to_u32(self.serialization.len()).unwrap());
            self.serialization.push('?');
            let scheme_type = SchemeType::from(self.scheme());
            let scheme_end = self.scheme_end;
            self.mutate(|parser| {
                let vfn = parser.violation_fn;
                parser.parse_query(
                    scheme_type,
                    scheme_end,
                    parser::Input::trim_tab_and_newlines(input, vfn),
                )
            });
        } else {
            self.query_start = None;
            self.strip_trailing_spaces_from_opaque_path();
        }

        self.restore_already_parsed_fragment(fragment);
    }

    /// Manipulate this URL’s query string, viewed as a sequence of name/value pairs
    /// in `application/x-www-form-urlencoded` syntax.
    ///
    /// The return value has a method-chaining API:
    ///
    /// ```rust
    /// # use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.net?lang=fr#nav")?;
    /// assert_eq!(url.query(), Some("lang=fr"));
    ///
    /// url.query_pairs_mut().append_pair("foo", "bar");
    /// assert_eq!(url.query(), Some("lang=fr&foo=bar"));
    /// assert_eq!(url.as_str(), "https://example.net/?lang=fr&foo=bar#nav");
    ///
    /// url.query_pairs_mut()
    ///     .clear()
    ///     .append_pair("foo", "bar & baz")
    ///     .append_pair("saisons", "\u{00C9}t\u{00E9}+hiver");
    /// assert_eq!(url.query(), Some("foo=bar+%26+baz&saisons=%C3%89t%C3%A9%2Bhiver"));
    /// assert_eq!(url.as_str(),
    ///            "https://example.net/?foo=bar+%26+baz&saisons=%C3%89t%C3%A9%2Bhiver#nav");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Note: `url.query_pairs_mut().clear();` is equivalent to `url.set_query(Some(""))`,
    /// not `url.set_query(None)`.
    ///
    /// The state of `Url` is unspecified if this return value is leaked without being dropped.
    pub fn query_pairs_mut(&mut self) -> form_urlencoded::Serializer<'_, UrlQuery<'_>> {
        let fragment = self.take_fragment();

        let query_start;
        if let Some(start) = self.query_start {
            debug_assert!(self.byte_at(start) == b'?');
            query_start = start as usize;
        } else {
            query_start = self.serialization.len();
            self.query_start = Some(to_u32(query_start).unwrap());
            self.serialization.push('?');
        }

        let query = UrlQuery {
            url: Some(self),
            fragment,
        };
        form_urlencoded::Serializer::for_suffix(query, query_start + "?".len())
    }
shell
sed -n '1720,1980p' url/src/lib.rs
output
Chunk ID: 59df7b
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 2303
Output:
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot set port for cannot-be-a-base URLs:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rms@example.net")?;
    ///
    /// let result = url.set_port(Some(80));
    /// assert!(result.is_err());
    ///
    /// let result = url.set_port(None);
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[allow(clippy::result_unit_err)]
    pub fn set_port(&mut self, mut port: Option<u16>) -> Result<(), ()> {
        // has_host implies !cannot_be_a_base
        if !self.has_host() || self.host() == Some(Host::Domain("")) || self.scheme() == "file" {
            return Err(());
        }
        if port.is_some() && port == parser::default_port(self.scheme()) {
            port = None
        }
        self.set_port_internal(port);
        Ok(())
    }

    fn set_port_internal(&mut self, port: Option<u16>) {
        match (self.port, port) {
            (None, None) => {}
            (Some(_), None) => {
                self.serialization
                    .drain(self.host_end as usize..self.path_start as usize);
                let offset = self.path_start - self.host_end;
                self.path_start = self.host_end;
                if let Some(ref mut index) = self.query_start {
                    *index -= offset
                }
                if let Some(ref mut index) = self.fragment_start {
                    *index -= offset
                }
            }
            (Some(old), Some(new)) if old == new => {}
            (_, Some(new)) => {
                let path_and_after = self.slice(self.path_start..).to_owned();
                self.serialization.truncate(self.host_end as usize);
                write!(&mut self.serialization, ":{}", new).unwrap();
                let old_path_start = self.path_start;
                let new_path_start = to_u32(self.serialization.len()).unwrap();
                self.path_start = new_path_start;
                let adjust = |index: &mut u32| {
                    *index -= old_path_start;
                    *index += new_path_start;
                };
                if let Some(ref mut index) = self.query_start {
                    adjust(index)
                }
                if let Some(ref mut index) = self.fragment_start {
                    adjust(index)
                }
                self.serialization.push_str(&path_and_after);
            }
        }
        self.port = port;
    }

    /// Change this URL’s host.
    ///
    /// Removing the host (calling this with `None`)
    /// will also remove any username, password, and port number.
    ///
    /// # Examples
    ///
    /// Change host:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.net")?;
    /// let result = url.set_host(Some("rust-lang.org"));
    /// assert!(result.is_ok());
    /// assert_eq!(url.as_str(), "https://rust-lang.org/");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Remove host:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("foo://example.net")?;
    /// let result = url.set_host(None);
    /// assert!(result.is_ok());
    /// assert_eq!(url.as_str(), "foo:/");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot remove host for 'special' schemes (e.g. `http`):
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.net")?;
    /// let result = url.set_host(None);
    /// assert!(result.is_err());
    /// assert_eq!(url.as_str(), "https://example.net/");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot change or remove host for cannot-be-a-base URLs:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rms@example.net")?;
    ///
    /// let result = url.set_host(Some("rust-lang.org"));
    /// assert!(result.is_err());
    /// assert_eq!(url.as_str(), "mailto:rms@example.net");
    ///
    /// let result = url.set_host(None);
    /// assert!(result.is_err());
    /// assert_eq!(url.as_str(), "mailto:rms@example.net");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// # Errors
    ///
    /// If this URL is cannot-be-a-base or there is an error parsing the given `host`,
    /// a [`ParseError`] variant will be returned.
    ///
    /// [`ParseError`]: enum.ParseError.html
    pub fn set_host(&mut self, host: Option<&str>) -> Result<(), ParseError> {
        if self.cannot_be_a_base() {
            return Err(ParseError::SetHostOnCannotBeABaseUrl);
        }

        let scheme_type = SchemeType::from(self.scheme());

        if let Some(host) = host {
            if host.is_empty() && scheme_type.is_special() && !scheme_type.is_file() {
                return Err(ParseError::EmptyHost);
            }
            let mut host_substr = host;
            // Otherwise, if c is U+003A (:) and the [] flag is unset, then
            if !host.starts_with('[') || !host.ends_with(']') {
                match host.find(':') {
                    Some(0) => {
                        // If buffer is the empty string, validation error, return failure.
                        return Err(ParseError::InvalidDomainCharacter);
                    }
                    // Let host be the result of host parsing buffer
                    Some(colon_index) => {
                        host_substr = &host[..colon_index];
                    }
                    None => {}
                }
            }
            if SchemeType::from(self.scheme()).is_special() {
                self.set_host_internal(Host::parse(host_substr)?, None);
            } else {
                self.set_host_internal(Host::parse_opaque(host_substr)?, None);
            }
        } else if self.has_host() {
            if scheme_type.is_special() && !scheme_type.is_file() {
                return Err(ParseError::EmptyHost);
            } else if self.serialization.len() == self.path_start as usize {
                self.serialization.push('/');
            }
            debug_assert!(self.byte_at(self.scheme_end) == b':');
            debug_assert!(self.byte_at(self.path_start) == b'/');

            let new_path_start = if scheme_type.is_file() {
                self.scheme_end + 3
            } else {
                self.scheme_end + 1
            };

            self.serialization
                .drain(new_path_start as usize..self.path_start as usize);
            let offset = self.path_start - new_path_start;
            self.path_start = new_path_start;
            self.username_end = new_path_start;
            self.host_start = new_path_start;
            self.host_end = new_path_start;
            self.port = None;
            if let Some(ref mut index) = self.query_start {
                *index -= offset
            }
            if let Some(ref mut index) = self.fragment_start {
                *index -= offset
            }
        }
        Ok(())
    }

    /// opt_new_port: None means leave unchanged, Some(None) means remove any port number.
    fn set_host_internal(&mut self, host: Host<String>, opt_new_port: Option<Option<u16>>) {
        let old_suffix_pos = if opt_new_port.is_some() {
            self.path_start
        } else {
            self.host_end
        };
        let suffix = self.slice(old_suffix_pos..).to_owned();
        self.serialization.truncate(self.host_start as usize);
        if !self.has_authority() {
            debug_assert!(self.slice(self.scheme_end..self.host_start) == ":");
            debug_assert!(self.username_end == self.host_start);
            self.serialization.push('/');
            self.serialization.push('/');
            self.username_end += 2;
            self.host_start += 2;
        }
        write!(&mut self.serialization, "{}", host).unwrap();
        self.host_end = to_u32(self.serialization.len()).unwrap();
        self.host = host.into();

        if let Some(new_port) = opt_new_port {
            self.port = new_port;
            if let Some(port) = new_port {
                write!(&mut self.serialization, ":{}", port).unwrap();
            }
        }
        let new_suffix_pos = to_u32(self.serialization.len()).unwrap();
        self.serialization.push_str(&suffix);

        let adjust = |index: &mut u32| {
            *index -= old_suffix_pos;
            *index += new_suffix_pos;
        };
        adjust(&mut self.path_start);
        if let Some(ref mut index) = self.query_start {
            adjust(index)
        }
        if let Some(ref mut index) = self.fragment_start {
            adjust(index)
        }
    }
shell
sed -n '2440,2525p' url/src/lib.rs
output
Chunk ID: de26b8
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 668
Output:
    /// Serialize with Serde using the internal representation of the `Url` struct.
    ///
    /// The corresponding `deserialize_internal` method sacrifices some invariant-checking
    /// for speed, compared to the `Deserialize` trait impl.
    ///
    /// This method is only available if the `serde` Cargo feature is enabled.
    #[cfg(feature = "serde")]
    #[deny(unused)]
    pub fn serialize_internal<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        use serde::Serialize;
        // Destructuring first lets us ensure that adding or removing fields forces this method
        // to be updated
        let Url {
            ref serialization,
            ref scheme_end,
            ref username_end,
            ref host_start,
            ref host_end,
            ref host,
            ref port,
            ref path_start,
            ref query_start,
            ref fragment_start,
        } = *self;
        (
            serialization,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            query_start,
            fragment_start,
        )
            .serialize(serializer)
    }

    /// Serialize with Serde using the internal representation of the `Url` struct.
    ///
    /// The corresponding `deserialize_internal` method sacrifices some invariant-checking
    /// for speed, compared to the `Deserialize` trait impl.
    ///
    /// This method is only available if the `serde` Cargo feature is enabled.
    #[cfg(feature = "serde")]
    #[deny(unused)]
    pub fn deserialize_internal<'de, D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        use serde::de::{Deserialize, Error, Unexpected};
        let (
            serialization,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            query_start,
            fragment_start,
        ) = Deserialize::deserialize(deserializer)?;
        let url = Url {
            serialization,
            scheme_end,
            username_end,
            host_start,
            host_end,
            host,
            port,
            path_start,
            query_start,
            fragment_start,
        };
        if cfg!(debug_assertions) {
            url.check_invariants().map_err(|reason| {
                let reason: &str = &reason;
                Error::invalid_value(Unexpected::Other("value"), &reason)
            })?
        }
        Ok(url)
I’m also tightening the path mutation paths while I’m here. Even though the report is mostly parse/join round-tripping, setters and path segment APIs share the same offsets, so leaving them unaware of the marker would make the new invariant fragile.
shell
rg -n "fn take_after_path|take_after_path" url/src/lib.rs url/src/path_segments.rs
output
Chunk ID: e50152
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 52
Output:
url/src/path_segments.rs:46:    let after_path = url.take_after_path();
url/src/lib.rs:1587:    fn take_after_path(&mut self) -> String {
url/src/lib.rs:1634:        let after_path = self.take_after_path();
shell
sed -n '1580,1625p' url/src/lib.rs
output
Chunk ID: b65eb6
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 434
Output:
        let query = UrlQuery {
            url: Some(self),
            fragment,
        };
        form_urlencoded::Serializer::for_suffix(query, query_start + "?".len())
    }

    fn take_after_path(&mut self) -> String {
        match (self.query_start, self.fragment_start) {
            (Some(i), _) | (None, Some(i)) => {
                let after_path = self.slice(i..).to_owned();
                self.serialization.truncate(i as usize);
                after_path
            }
            (None, None) => String::new(),
        }
    }

    /// Change this URL’s path.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/comments");
    /// assert_eq!(url.as_str(), "https://example.com/api/comments");
    /// assert_eq!(url.path(), "/api/comments");
    ///
    /// let mut url = Url::parse("https://example.com/api")?;
    /// url.set_path("data/report.csv");
    /// assert_eq!(url.as_str(), "https://example.com/data/report.csv");
    /// assert_eq!(url.path(), "/data/report.csv");
    ///
    /// // `set_path` percent-encodes the given string if it's not already percent-encoded.
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/some comments");
    /// assert_eq!(url.as_str(), "https://example.com/api/some%20comments");
    /// assert_eq!(url.path(), "/api/some%20comments");
    ///
    /// // `set_path` will not double percent-encode the string if it's already percent-encoded.
    /// let mut url = Url::parse("https://example.com")?;
    /// url.set_path("api/some%20comments");
shell
sed -n '1980,2210p' url/src/lib.rs
output
Chunk ID: 52dce3
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 2086
Output:
    }

    /// Change this URL’s host to the given IP address.
    ///
    /// If this URL is cannot-be-a-base, do nothing and return `Err`.
    ///
    /// Compared to `Url::set_host`, this skips the host parser.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("http://example.com")?;
    /// url.set_ip_host("127.0.0.1".parse().unwrap());
    /// assert_eq!(url.host_str(), Some("127.0.0.1"));
    /// assert_eq!(url.as_str(), "http://127.0.0.1/");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot change URL's from mailto(cannot-be-base) to ip:
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rms@example.com")?;
    /// let result = url.set_ip_host("127.0.0.1".parse().unwrap());
    ///
    /// assert_eq!(url.as_str(), "mailto:rms@example.com");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    #[allow(clippy::result_unit_err)]
    pub fn set_ip_host(&mut self, address: IpAddr) -> Result<(), ()> {
        if self.cannot_be_a_base() {
            return Err(());
        }

        let address = match address {
            IpAddr::V4(address) => Host::Ipv4(address),
            IpAddr::V6(address) => Host::Ipv6(address),
        };
        self.set_host_internal(address, None);
        Ok(())
    }

    /// Change this URL’s password.
    ///
    /// If this URL is cannot-be-a-base or does not have a host, do nothing and return `Err`.
    ///
    /// # Examples
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rmz@example.com")?;
    /// let result = url.set_password(Some("secret_password"));
    /// assert!(result.is_err());
    ///
    /// let mut url = Url::parse("ftp://user1:secret1@example.com")?;
    /// let result = url.set_password(Some("secret_password"));
    /// assert_eq!(url.password(), Some("secret_password"));
    ///
    /// let mut url = Url::parse("ftp://user2:@example.com")?;
    /// let result = url.set_password(Some("secret2"));
    /// assert!(result.is_ok());
    /// assert_eq!(url.password(), Some("secret2"));
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[allow(clippy::result_unit_err)]
    pub fn set_password(&mut self, password: Option<&str>) -> Result<(), ()> {
        // has_host implies !cannot_be_a_base
        if !self.has_host() || self.host() == Some(Host::Domain("")) || self.scheme() == "file" {
            return Err(());
        }
        if let Some(password) = password {
            let host_and_after = self.slice(self.host_start..).to_owned();
            self.serialization.truncate(self.username_end as usize);
            self.serialization.push(':');
            self.serialization
                .extend(utf8_percent_encode(password, USERINFO));
            self.serialization.push('@');

            let old_host_start = self.host_start;
            let new_host_start = to_u32(self.serialization.len()).unwrap();
            let adjust = |index: &mut u32| {
                *index -= old_host_start;
                *index += new_host_start;
            };
            self.host_start = new_host_start;
            adjust(&mut self.host_end);
            adjust(&mut self.path_start);
            if let Some(ref mut index) = self.query_start {
                adjust(index)
            }
            if let Some(ref mut index) = self.fragment_start {
                adjust(index)
            }

            self.serialization.push_str(&host_and_after);
        } else if self.byte_at(self.username_end) == b':' {
            // If there is a password to remove
            let has_username_or_password = self.byte_at(self.host_start - 1) == b'@';
            debug_assert!(has_username_or_password);
            let username_start = self.scheme_end + 3;
            let empty_username = username_start == self.username_end;
            let start = self.username_end; // Remove the ':'
            let end = if empty_username {
                self.host_start // Remove the '@' as well
            } else {
                self.host_start - 1 // Keep the '@' to separate the username from the host
            };
            self.serialization.drain(start as usize..end as usize);
            let offset = end - start;
            self.host_start -= offset;
            self.host_end -= offset;
            self.path_start -= offset;
            if let Some(ref mut index) = self.query_start {
                *index -= offset
            }
            if let Some(ref mut index) = self.fragment_start {
                *index -= offset
            }
        }
        Ok(())
    }

    /// Change this URL’s username.
    ///
    /// If this URL is cannot-be-a-base or does not have a host, do nothing and return `Err`.
    /// # Examples
    ///
    /// Cannot setup username from mailto(cannot-be-base)
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rmz@example.com")?;
    /// let result = url.set_username("user1");
    /// assert_eq!(url.as_str(), "mailto:rmz@example.com");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Setup username to user1
    ///
    /// ```rust
    /// use url::{Url, ParseError};
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("ftp://:secre1@example.com/")?;
    /// let result = url.set_username("user1");
    /// assert!(result.is_ok());
    /// assert_eq!(url.username(), "user1");
    /// assert_eq!(url.as_str(), "ftp://user1:secre1@example.com/");
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[allow(clippy::result_unit_err)]
    pub fn set_username(&mut self, username: &str) -> Result<(), ()> {
        // has_host implies !cannot_be_a_base
        if !self.has_host() || self.host() == Some(Host::Domain("")) || self.scheme() == "file" {
            return Err(());
        }
        let username_start = self.scheme_end + 3;
        debug_assert!(self.slice(self.scheme_end..username_start) == "://");
        if self.slice(username_start..self.username_end) == username {
            return Ok(());
        }
        let after_username = self.slice(self.username_end..).to_owned();
        self.serialization.truncate(username_start as usize);
        self.serialization
            .extend(utf8_percent_encode(username, USERINFO));

        let mut removed_bytes = self.username_end;
        self.username_end = to_u32(self.serialization.len()).unwrap();
        let mut added_bytes = self.username_end;

        let new_username_is_empty = self.username_end == username_start;
        match (new_username_is_empty, after_username.chars().next()) {
            (true, Some('@')) => {
                removed_bytes += 1;
                self.serialization.push_str(&after_username[1..]);
            }
            (false, Some('@')) | (_, Some(':')) | (true, _) => {
                self.serialization.push_str(&after_username);
            }
            (false, _) => {
                added_bytes += 1;
                self.serialization.push('@');
                self.serialization.push_str(&after_username);
            }
        }

        let adjust = |index: &mut u32| {
            *index -= removed_bytes;
            *index += added_bytes;
        };
        adjust(&mut self.host_start);
        adjust(&mut self.host_end);
        adjust(&mut self.path_start);
        if let Some(ref mut index) = self.query_start {
            adjust(index)
        }
        if let Some(ref mut index) = self.fragment_start {
            adjust(index)
        }
        Ok(())
    }

    /// Change this URL’s scheme.
    ///
    /// Do nothing and return `Err` under the following circumstances:
    ///
    /// * If the new scheme is not in `[a-zA-Z][a-zA-Z0-9+.-]+`
    /// * If this URL is cannot-be-a-base and the new scheme is one of
    ///   `http`, `https`, `ws`, `wss` or `ftp`
shell
sed -n '2200,2360p' url/src/lib.rs
output
Chunk ID: c3726e
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1434
Output:
        }
        Ok(())
    }

    /// Change this URL’s scheme.
    ///
    /// Do nothing and return `Err` under the following circumstances:
    ///
    /// * If the new scheme is not in `[a-zA-Z][a-zA-Z0-9+.-]+`
    /// * If this URL is cannot-be-a-base and the new scheme is one of
    ///   `http`, `https`, `ws`, `wss` or `ftp`
    /// * If either the old or new scheme is `http`, `https`, `ws`,
    ///   `wss` or `ftp` and the other is not one of these
    /// * If the new scheme is `file` and this URL includes credentials
    ///   or has a non-null port
    /// * If this URL's scheme is `file` and its host is empty or null
    ///
    /// See also [the URL specification's section on legal scheme state
    /// overrides](https://url.spec.whatwg.org/#scheme-state).
    ///
    /// # Examples
    ///
    /// Change the URL’s scheme from `https` to `http`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.net")?;
    /// let result = url.set_scheme("http");
    /// assert_eq!(url.as_str(), "http://example.net/");
    /// assert!(result.is_ok());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    /// Change the URL’s scheme from `foo` to `bar`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("foo://example.net")?;
    /// let result = url.set_scheme("bar");
    /// assert_eq!(url.as_str(), "bar://example.net");
    /// assert!(result.is_ok());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot change URL’s scheme from `https` to `foõ`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("https://example.net")?;
    /// let result = url.set_scheme("foõ");
    /// assert_eq!(url.as_str(), "https://example.net/");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    ///
    /// Cannot change URL’s scheme from `mailto` (cannot-be-a-base) to `https`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("mailto:rms@example.net")?;
    /// let result = url.set_scheme("https");
    /// assert_eq!(url.as_str(), "mailto:rms@example.net");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    /// Cannot change the URL’s scheme from `foo` to `https`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("foo://example.net")?;
    /// let result = url.set_scheme("https");
    /// assert_eq!(url.as_str(), "foo://example.net");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    /// Cannot change the URL’s scheme from `http` to `foo`:
    ///
    /// ```
    /// use url::Url;
    /// # use url::ParseError;
    ///
    /// # fn run() -> Result<(), ParseError> {
    /// let mut url = Url::parse("http://example.net")?;
    /// let result = url.set_scheme("foo");
    /// assert_eq!(url.as_str(), "http://example.net/");
    /// assert!(result.is_err());
    /// # Ok(())
    /// # }
    /// # run().unwrap();
    /// ```
    #[allow(clippy::result_unit_err, clippy::suspicious_operation_groupings)]
    pub fn set_scheme(&mut self, scheme: &str) -> Result<(), ()> {
        let mut parser = Parser::for_setter(String::new());
        let remaining = parser.parse_scheme(parser::Input::new(scheme))?;
        let new_scheme_type = SchemeType::from(&parser.serialization);
        let old_scheme_type = SchemeType::from(self.scheme());
        // If url’s scheme is a special scheme and buffer is not a special scheme, then return.
        if (new_scheme_type.is_special() && !old_scheme_type.is_special()) ||
            // If url’s scheme is not a special scheme and buffer is a special scheme, then return.
            (!new_scheme_type.is_special() && old_scheme_type.is_special()) ||
            // If url includes credentials or has a non-null port, and buffer is "file", then return.
            // If url’s scheme is "file" and its host is an empty host or null, then return.
            (new_scheme_type.is_file() && self.has_authority())
        {
            return Err(());
        }

        if !remaining.is_empty() || (!self.has_host() && new_scheme_type.is_special()) {
            return Err(());
        }
        let old_scheme_end = self.scheme_end;
        let new_scheme_end = to_u32(parser.serialization.len()).unwrap();
        let adjust = |index: &mut u32| {
            *index -= old_scheme_end;
            *index += new_scheme_end;
        };

        self.scheme_end = new_scheme_end;
        adjust(&mut self.username_end);
        adjust(&mut self.host_start);
        adjust(&mut self.host_end);
        adjust(&mut self.path_start);
        if let Some(ref mut index) = self.query_start {
            adjust(index)
        }
        if let Some(ref mut index) = self.fragment_start {
            adjust(index)
        }

        parser.serialization.push_str(self.slice(old_scheme_end..));
        self.serialization = parser.serialization;

        // Update the port so it can be removed
        // If it is the scheme's default
        // we don't mind it silently failing
        // if there was no port in the first place
        let previous_port = self.port();
The relative join branches need two different behaviors: query/fragment joins copy the stored URL unchanged, while path-resolving joins must resolve against the logical path and then re-insert the marker only if the final path still starts with `//`. That distinction is where most of the patch will be.
shell
sed -n '1,220p' url/tests/unit.rs
output
Chunk ID: 7a3f27
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1744
Output:
// Copyright 2013-2014 The rust-url developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Unit tests

use std::borrow::Cow;
use std::cell::{Cell, RefCell};
use std::net::{Ipv4Addr, Ipv6Addr};
use std::path::{Path, PathBuf};
use url::{form_urlencoded, Host, Origin, Url};

#[test]
fn size() {
    use std::mem::size_of;
    assert_eq!(size_of::<Url>(), size_of::<Option<Url>>());
}

#[test]
fn test_relative() {
    let base: Url = "sc://%C3%B1".parse().unwrap();
    let url = base.join("/resources/testharness.js").unwrap();
    assert_eq!(url.as_str(), "sc://%C3%B1/resources/testharness.js");
}

#[test]
fn test_relative_empty() {
    let base: Url = "sc://%C3%B1".parse().unwrap();
    let url = base.join("").unwrap();
    assert_eq!(url.as_str(), "sc://%C3%B1");
}

#[test]
fn test_strip_trailing_spaces_from_opaque_path() {
    let mut url: Url = "data:space   ?query".parse().unwrap();
    url.set_query(None);
    assert_eq!(url.as_str(), "data:space");

    let mut url: Url = "data:space   #hash".parse().unwrap();
    url.set_fragment(None);
    assert_eq!(url.as_str(), "data:space");
}

#[test]
fn test_set_empty_host() {
    let mut base: Url = "moz://foo:bar@servo/baz".parse().unwrap();
    base.set_username("").unwrap();
    assert_eq!(base.as_str(), "moz://:bar@servo/baz");
    base.set_host(None).unwrap();
    assert_eq!(base.as_str(), "moz:/baz");
    base.set_host(Some("servo")).unwrap();
    assert_eq!(base.as_str(), "moz://servo/baz");

    let mut base: Url = "file://server/share/foo/bar".parse().unwrap();
    base.set_host(None).unwrap();
    assert_eq!(base.as_str(), "file:///share/foo/bar");

    let mut base: Url = "file://server/share/foo/bar".parse().unwrap();
    base.set_host(Some("foo")).unwrap();
    assert_eq!(base.as_str(), "file://foo/share/foo/bar");
}

#[test]
fn test_set_empty_hostname() {
    use url::quirks;
    let mut base: Url = "moz://foo@servo/baz".parse().unwrap();
    assert!(
        quirks::set_hostname(&mut base, "").is_err(),
        "setting an empty hostname to a url with a username should fail"
    );
    base = "moz://:pass@servo/baz".parse().unwrap();
    assert!(
        quirks::set_hostname(&mut base, "").is_err(),
        "setting an empty hostname to a url with a password should fail"
    );
    base = "moz://servo/baz".parse().unwrap();
    quirks::set_hostname(&mut base, "").unwrap();
    assert_eq!(base.as_str(), "moz:///baz");
}

macro_rules! assert_from_file_path {
    ($path: expr) => {
        assert_from_file_path!($path, $path)
    };
    ($path: expr, $url_path: expr) => {{
        let url = Url::from_file_path(Path::new($path)).unwrap();
        assert_eq!(url.host(), None);
        assert_eq!(url.path(), $url_path);
        assert_eq!(url.to_file_path(), Ok(PathBuf::from($path)));
    }};
}

#[test]
fn new_file_paths() {
    if cfg!(unix) {
        assert_eq!(Url::from_file_path(Path::new("relative")), Err(()));
        assert_eq!(Url::from_file_path(Path::new("../relative")), Err(()));
    }
    if cfg!(windows) {
        assert_eq!(Url::from_file_path(Path::new("relative")), Err(()));
        assert_eq!(Url::from_file_path(Path::new(r"..\relative")), Err(()));
        assert_eq!(Url::from_file_path(Path::new(r"\drive-relative")), Err(()));
        assert_eq!(Url::from_file_path(Path::new(r"\\ucn\")), Err(()));
    }

    if cfg!(unix) {
        assert_from_file_path!("/foo/bar");
        assert_from_file_path!("/foo/ba\0r", "/foo/ba%00r");
        assert_from_file_path!("/foo/ba%00r", "/foo/ba%2500r");
    }
}

#[test]
#[cfg(unix)]
fn new_path_bad_utf8() {
    use std::ffi::OsStr;
    use std::os::unix::prelude::*;

    let url = Url::from_file_path(Path::new(OsStr::from_bytes(b"/foo/ba\x80r"))).unwrap();
    let os_str = OsStr::from_bytes(b"/foo/ba\x80r");
    assert_eq!(url.to_file_path(), Ok(PathBuf::from(os_str)));
}

#[test]
fn new_path_windows_fun() {
    if cfg!(windows) {
        assert_from_file_path!(r"C:\foo\bar", "/C:/foo/bar");
        assert_from_file_path!("C:\\foo\\ba\0r", "/C:/foo/ba%00r");

        // Invalid UTF-8
        assert!(Url::parse("file:///C:/foo/ba%80r")
            .unwrap()
            .to_file_path()
            .is_err());

        // test windows canonicalized path
        let path = PathBuf::from(r"\\?\C:\foo\bar");
        assert!(Url::from_file_path(path).is_ok());

        // Percent-encoded drive letter
        let url = Url::parse("file:///C%3A/foo/bar").unwrap();
        assert_eq!(url.to_file_path(), Ok(PathBuf::from(r"C:\foo\bar")));
    }
}

#[test]
fn new_directory_paths() {
    if cfg!(unix) {
        assert_eq!(Url::from_directory_path(Path::new("relative")), Err(()));
        assert_eq!(Url::from_directory_path(Path::new("../relative")), Err(()));

        let url = Url::from_directory_path(Path::new("/foo/bar")).unwrap();
        assert_eq!(url.host(), None);
        assert_eq!(url.path(), "/foo/bar/");
    }
    if cfg!(windows) {
        assert_eq!(Url::from_directory_path(Path::new("relative")), Err(()));
        assert_eq!(Url::from_directory_path(Path::new(r"..\relative")), Err(()));
        assert_eq!(
            Url::from_directory_path(Path::new(r"\drive-relative")),
            Err(())
        );
        assert_eq!(Url::from_directory_path(Path::new(r"\\ucn\")), Err(()));

        let url = Url::from_directory_path(Path::new(r"C:\foo\bar")).unwrap();
        assert_eq!(url.host(), None);
        assert_eq!(url.path(), "/C:/foo/bar/");
    }
}

#[test]
fn path_backslash_fun() {
    let mut special_url = "http://foobar.com".parse::<Url>().unwrap();
    special_url.path_segments_mut().unwrap().push("foo\\bar");
    assert_eq!(special_url.as_str(), "http://foobar.com/foo%5Cbar");

    let mut nonspecial_url = "thing://foobar.com".parse::<Url>().unwrap();
    nonspecial_url.path_segments_mut().unwrap().push("foo\\bar");
    assert_eq!(nonspecial_url.as_str(), "thing://foobar.com/foo\\bar");
}

#[test]
fn from_str() {
    assert!("http://testing.com/this".parse::<Url>().is_ok());
}

#[test]
fn parse_with_params() {
    let url = Url::parse_with_params(
        "http://testing.com/this?dont=clobberme",
        &[("lang", "rust")],
    )
    .unwrap();

    assert_eq!(
        url.as_str(),
        "http://testing.com/this?dont=clobberme&lang=rust"
    );
}

#[test]
fn issue_124() {
    let url: Url = "file:a".parse().unwrap();
    assert_eq!(url.path(), "/a");
    let url: Url = "file:...".parse().unwrap();
    assert_eq!(url.path(), "/...");
    let url: Url = "file:..".parse().unwrap();
    assert_eq!(url.path(), "/");
}

#[test]
fn test_equality() {
    use std::collections::hash_map::DefaultHasher;
    use std::hash::{Hash, Hasher};

    fn check_eq(a: &Url, b: &Url) {
shell
tail -n 120 url/tests/unit.rs
output
Chunk ID: 235688
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 1067
Output:
        ),
        (
            "http://127.0.0.1:8080/test/?foo=bar#123",
            "http://127.0.0.1:8080/test/video",
            "video",
        ),
        (
            "http://127.0.0.1:8080/test/",
            "http://127.0.0.1:8080/test/video?baz=meh#456",
            "video?baz=meh#456",
        ),
        (
            "http://127.0.0.1:8080/test",
            "http://127.0.0.1:8080/test?baz=meh#456",
            "?baz=meh#456",
        ),
        (
            "http://127.0.0.1:8080/test/",
            "http://127.0.0.1:8080/test?baz=meh#456",
            "../test?baz=meh#456",
        ),
        (
            "http://127.0.0.1:8080/test/",
            "http://127.0.0.1:8080/test/?baz=meh#456",
            "?baz=meh#456",
        ),
        (
            "http://127.0.0.1:8080/test/?foo=bar#123",
            "http://127.0.0.1:8080/test/video?baz=meh#456",
            "video?baz=meh#456",
        ),
        (
            "http://127.0.0.1:8080/file.txt",
            "http://127.0.0.1:8080/test/file.txt",
            "test/file.txt",
        ),
        (
            "http://127.0.0.1:8080/not_equal.txt",
            "http://127.0.0.1:8080/test/file.txt",
            "test/file.txt",
        ),
    ];

    for (base, uri, relative) in &tests {
        let base_uri = url::Url::parse(base).unwrap();
        let relative_uri = url::Url::parse(uri).unwrap();
        let make_relative = base_uri.make_relative(&relative_uri).unwrap();
        assert_eq!(
            make_relative, *relative,
            "base: {}, uri: {}, relative: {}",
            base, uri, relative
        );
        assert_eq!(
            base_uri.join(relative).unwrap().as_str(),
            *uri,
            "base: {}, uri: {}, relative: {}",
            base,
            uri,
            relative
        );
    }

    let error_tests = [
        ("http://127.0.0.1:8080/", "https://127.0.0.1:8080/test/"),
        ("http://127.0.0.1:8080/", "http://127.0.0.1:8081/test/"),
        ("http://127.0.0.1:8080/", "http://127.0.0.2:8080/test/"),
        ("mailto:a@example.com", "mailto:b@example.com"),
    ];

    for (base, uri) in &error_tests {
        let base_uri = url::Url::parse(base).unwrap();
        let relative_uri = url::Url::parse(uri).unwrap();
        let make_relative = base_uri.make_relative(&relative_uri);
        assert_eq!(make_relative, None, "base: {}, uri: {}", base, uri);
    }
}

#[test]
fn test_has_authority() {
    let url = Url::parse("mailto:joe@example.com").unwrap();
    assert!(!url.has_authority());
    let url = Url::parse("unix:/run/foo.socket").unwrap();
    assert!(!url.has_authority());
    let url = Url::parse("file:///tmp/foo").unwrap();
    assert!(url.has_authority());
    let url = Url::parse("http://example.com/tmp/foo").unwrap();
    assert!(url.has_authority());
}

#[test]
fn test_authority() {
    let url = Url::parse("mailto:joe@example.com").unwrap();
    assert_eq!(url.authority(), "");
    let url = Url::parse("unix:/run/foo.socket").unwrap();
    assert_eq!(url.authority(), "");
    let url = Url::parse("file:///tmp/foo").unwrap();
    assert_eq!(url.authority(), "");
    let url = Url::parse("http://example.com/tmp/foo").unwrap();
    assert_eq!(url.authority(), "example.com");
    let url = Url::parse("ftp://127.0.0.1:21/").unwrap();
    assert_eq!(url.authority(), "127.0.0.1");
    let url = Url::parse("ftp://user@127.0.0.1:2121/").unwrap();
    assert_eq!(url.authority(), "user@127.0.0.1:2121");
    let url = Url::parse("https://:@example.com/").unwrap();
    assert_eq!(url.authority(), "example.com");
    let url = Url::parse("https://:password@[::1]:8080/").unwrap();
    assert_eq!(url.authority(), ":password@[::1]:8080");
    let url = Url::parse("gopher://user:@àlex.example.com:70").unwrap();
    assert_eq!(url.authority(), "user@%C3%A0lex.example.com:70");
    let url = Url::parse("irc://àlex:àlex@àlex.рф.example.com:6667/foo").unwrap();
    assert_eq!(
        url.authority(),
        "%C3%A0lex:%C3%A0lex@%C3%A0lex.%D1%80%D1%84.example.com:6667"
    );
    let url = Url::parse("https://àlex:àlex@àlex.рф.example.com:443/foo").unwrap();
    assert_eq!(
        url.authority(),
        "%C3%A0lex:%C3%A0lex@xn--lex-8ka.xn--p1ai.example.com"
    );
}
I’m ready to edit. The patch will add a private marker helper on `Url`, call it after parser path normalization, teach path-resolving joins to work from the unmarked logical path, and adjust slicing so `AfterPort..BeforePath` exposes `/.`.
apply_patch
*** Begin Patch
*** Update File: /app/url/src/lib.rs
@@
 impl Url {
+    fn has_no_authority_components(&self) -> bool {
+        let scheme_end = self.scheme_end + ":".len() as u32;
+        self.username_end == scheme_end
+            && self.host_start == scheme_end
+            && self.host_end == scheme_end
+            && self.host == HostInternal::None
+            && self.port.is_none()
+    }
+
+    pub(crate) fn path_marker_start(&self) -> Option<u32> {
+        if SchemeType::from(self.scheme()).is_special()
+            || !self.has_no_authority_components()
+            || self.path_start < "/.".len() as u32
+        {
+            return None;
+        }
+
+        let marker_start = self.path_start - "/.".len() as u32;
+        if self.slice(marker_start..self.path_start) == "/." && self.path().starts_with("//") {
+            Some(marker_start)
+        } else {
+            None
+        }
+    }
+
+    pub(crate) fn path_start_without_marker(&self) -> u32 {
+        self.path_marker_start().unwrap_or(self.path_start)
+    }
+
+    pub(crate) fn ensure_non_special_path_marker(&mut self) {
+        let marker_start = self.path_marker_start();
+        let needs_marker = !SchemeType::from(self.scheme()).is_special()
+            && self.has_no_authority_components()
+            && self.path().starts_with("//");
+
+        match (needs_marker, marker_start) {
+            (true, None) => {
+                self.serialization
+                    .insert_str(self.path_start as usize, "/.");
+                self.path_start += "/.".len() as u32;
+                if let Some(ref mut index) = self.query_start {
+                    *index += "/.".len() as u32;
+                }
+                if let Some(ref mut index) = self.fragment_start {
+                    *index += "/.".len() as u32;
+                }
+            }
+            (false, Some(marker_start)) => {
+                self.serialization
+                    .drain(marker_start as usize..self.path_start as usize);
+                self.path_start = marker_start;
+                if let Some(ref mut index) = self.query_start {
+                    *index -= "/.".len() as u32;
+                }
+                if let Some(ref mut index) = self.fragment_start {
+                    *index -= "/.".len() as u32;
+                }
+            }
+            _ => {}
+        }
+    }
+
     /// Parse an absolute URL from a string.
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/lib.rs
The helper is in place. Next I’m wiring it into parser completion and relative joins, where the distinction between stored text and logical path matters.
apply_patch
*** Begin Patch
*** Update File: /app/url/src/parser.rs
@@
             Some('/') | Some('\\') => {
                 let (slashes_count, remaining) = input.count_matching(|c| matches!(c, '/' | '\\'));
                 if slashes_count >= 2 {
@@
                     return self.after_double_slash(remaining, scheme_type, scheme_end);
                 }
-                let path_start = base_url.path_start;
+                let path_start = base_url.path_start_without_marker();
                 self.serialization.push_str(base_url.slice(..path_start));
                 self.serialization.push('/');
                 let remaining = self.parse_path(
                     scheme_type,
                     &mut true,
@@
             }
             _ => {
-                let before_query = match (base_url.query_start, base_url.fragment_start) {
-                    (None, None) => &*base_url.serialization,
-                    (Some(i), _) | (None, Some(i)) => base_url.slice(..i),
-                };
-                self.serialization.push_str(before_query);
+                let path_start = base_url.path_start_without_marker();
+                self.serialization.push_str(base_url.slice(..path_start));
+                self.serialization.push_str(base_url.path());
                 // FIXME spec says just "remove last entry", not the "pop" algorithm
-                self.pop_path(scheme_type, base_url.path_start as usize);
+                self.pop_path(scheme_type, path_start as usize);
                 // A special url always has a path.
                 // A path always starts with '/'
-                if self.serialization.len() == base_url.path_start as usize
+                if self.serialization.len() == path_start as usize
                     && (SchemeType::from(base_url.scheme()).is_special() || !input.is_empty())
                 {
                     self.serialization.push('/');
                 }
                 let remaining = match input.split_first() {
                     (Some('/'), remaining) => self.parse_path(
                         scheme_type,
                         &mut true,
-                        base_url.path_start as usize,
+                        path_start as usize,
                         remaining,
                     ),
                     _ => {
-                        self.parse_path(scheme_type, &mut true, base_url.path_start as usize, input)
+                        self.parse_path(scheme_type, &mut true, path_start as usize, input)
                     }
                 };
                 self.with_query_and_fragment(
                     scheme_type,
                     base_url.scheme_end,
@@
                     base_url.host_start,
                     base_url.host_end,
                     base_url.host,
                     base_url.port,
-                    base_url.path_start,
+                    path_start,
                     remaining,
                 )
             }
         }
     }
@@
-        let (query_start, fragment_start) =
-            self.parse_query_and_fragment(scheme_type, scheme_end, remaining)?;
-        Ok(Url {
+        let (query_start, fragment_start) =
+            self.parse_query_and_fragment(scheme_type, scheme_end, remaining)?;
+        let mut url = Url {
             serialization: self.serialization,
             scheme_end,
             username_end,
             host_start,
             host_end,
@@
             path_start,
             query_start,
             fragment_start,
-        })
+        };
+        url.ensure_non_special_path_marker();
+        Ok(url)
     }
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/parser.rs
shell
sed -n '750,825p' url/src/parser.rs
output
Chunk ID: 59b9e9
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 826
Output:
                    self.log_violation_if(SyntaxViolation::ExpectedDoubleSlash, || {
                        input
                            .clone()
                            .take_while(|&c| matches!(c, '/' | '\\'))
                            .collect::<String>()
                            != "//"
                    });
                    let scheme_end = base_url.scheme_end;
                    debug_assert!(base_url.byte_at(scheme_end) == b':');
                    self.serialization
                        .push_str(base_url.slice(..scheme_end + 1));
                    if let Some(after_prefix) = input.split_prefix("//") {
                        return self.after_double_slash(after_prefix, scheme_type, scheme_end);
                    }
                    return self.after_double_slash(remaining, scheme_type, scheme_end);
                }
                let path_start = base_url.path_start_without_marker();
                self.serialization.push_str(base_url.slice(..path_start));
                self.serialization.push('/');
                let remaining = self.parse_path(
                    scheme_type,
                    &mut true,
                    path_start as usize,
                    input_after_first_char,
                );
                self.with_query_and_fragment(
                    scheme_type,
                    base_url.scheme_end,
                    base_url.username_end,
                    base_url.host_start,
                    base_url.host_end,
                    base_url.host,
                    base_url.port,
                    base_url.path_start,
                    remaining,
                )
            }
            _ => {
                let path_start = base_url.path_start_without_marker();
                self.serialization.push_str(base_url.slice(..path_start));
                self.serialization.push_str(base_url.path());
                // FIXME spec says just "remove last entry", not the "pop" algorithm
                self.pop_path(scheme_type, path_start as usize);
                // A special url always has a path.
                // A path always starts with '/'
                if self.serialization.len() == path_start as usize
                    && (SchemeType::from(base_url.scheme()).is_special() || !input.is_empty())
                {
                    self.serialization.push('/');
                }
                let remaining = match input.split_first() {
                    (Some('/'), remaining) => self.parse_path(
                        scheme_type,
                        &mut true,
                        path_start as usize,
                        remaining,
                    ),
                    _ => {
                        self.parse_path(scheme_type, &mut true, path_start as usize, input)
                    }
                };
                self.with_query_and_fragment(
                    scheme_type,
                    base_url.scheme_end,
                    base_url.username_end,
                    base_url.host_start,
                    base_url.host_end,
                    base_url.host,
                    base_url.port,
                    path_start,
                    remaining,
                )
            }
        }
    }

apply_patch
*** Begin Patch
*** Update File: /app/url/src/parser.rs
@@
                     base_url.host_start,
                     base_url.host_end,
                     base_url.host,
                     base_url.port,
-                    base_url.path_start,
+                    path_start,
                     remaining,
                 )
             }
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/parser.rs
Parser completion now normalizes the marker after the path is resolved. I found one join branch still passing the old logical offset and corrected it so marker insertion is recomputed from the final resolved path.
apply_patch
*** Begin Patch
*** Update File: /app/url/src/slicing.rs
@@
-            Position::AfterPort => self.path_start as usize,
+            Position::AfterPort => self.path_start_without_marker() as usize,
 
             Position::BeforePath => self.path_start as usize,
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/slicing.rs
Slicing now exposes the serialized marker only between `AfterPort` and `BeforePath`. I’m updating internal invariants and path setters so they use the marker boundary where they mean “before serialized path”.
apply_patch
*** Begin Patch
*** Update File: /app/url/src/lib.rs
@@
-        if self.slice(self.scheme_end + 1..).starts_with("//") {
+        if self.has_authority() {
             // URL with authority
             if self.username_end != self.serialization.len() as u32 {
                 match self.byte_at(self.username_end) {
@@
         } else {
             // Anarchist URL (no authority)
             assert_eq!(self.username_end, self.scheme_end + 1);
             assert_eq!(self.host_start, self.scheme_end + 1);
             assert_eq!(self.host_end, self.scheme_end + 1);
             assert_eq!(self.host, HostInternal::None);
             assert_eq!(self.port, None);
-            assert_eq!(self.path_start, self.scheme_end + 1);
+            let path_start_without_marker = self.path_start_without_marker();
+            assert_eq!(path_start_without_marker, self.scheme_end + 1);
+            if self.path_start != path_start_without_marker {
+                assert_eq!(self.slice(path_start_without_marker..self.path_start), "/.");
+                assert!(self.path().starts_with("//"));
+            }
         }
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/lib.rs
apply_patch
*** Begin Patch
*** Update File: /app/url/src/lib.rs
@@
         let after_path = self.take_after_path();
         let old_after_path_pos = to_u32(self.serialization.len()).unwrap();
         let cannot_be_a_base = self.cannot_be_a_base();
         let scheme_type = SchemeType::from(self.scheme());
-        self.serialization.truncate(self.path_start as usize);
+        let path_start = self.path_start_without_marker();
+        self.serialization.truncate(path_start as usize);
+        self.path_start = path_start;
         self.mutate(|parser| {
             if cannot_be_a_base {
                 if path.starts_with('/') {
                     parser.serialization.push_str("%2F");
                     path = &path[1..];
@@
                 parser.parse_path_start(scheme_type, &mut has_host, parser::Input::new(path));
             }
         });
+        self.ensure_non_special_path_marker();
         self.restore_after_path(old_after_path_pos, &after_path);
     }
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/lib.rs
apply_patch
*** Begin Patch
*** Update File: /app/url/src/path_segments.rs
@@
 impl<'a> Drop for PathSegmentsMut<'a> {
     fn drop(&mut self) {
+        self.url.ensure_non_special_path_marker();
         self.url
             .restore_after_path(self.old_after_path_position, &self.after_path)
     }
 }
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/path_segments.rs
apply_patch
*** Begin Patch
*** Update File: /app/url/src/lib.rs
@@
             if let Some(ref mut index) = self.fragment_start {
                 *index -= offset
             }
+            self.ensure_non_special_path_marker();
         }
         Ok(())
     }
@@
     /// opt_new_port: None means leave unchanged, Some(None) means remove any port number.
     fn set_host_internal(&mut self, host: Host<String>, opt_new_port: Option<Option<u16>>) {
         let old_suffix_pos = if opt_new_port.is_some() {
             self.path_start
+        } else if self.path_marker_start().is_some() {
+            self.path_start
         } else {
             self.host_end
         };
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/src/lib.rs
The shared setters now recompute or remove the marker when they change the logical path or host state. I’m adding focused unit coverage for parsing, slicing, and the join cases the bug describes.
apply_patch
*** Begin Patch
*** Update File: /app/url/tests/unit.rs
@@
-use url::{form_urlencoded, Host, Origin, Url};
+use url::{form_urlencoded, Host, Origin, Position, Url};
@@
 fn test_relative_empty() {
     let base: Url = "sc://%C3%B1".parse().unwrap();
     let url = base.join("").unwrap();
     assert_eq!(url.as_str(), "sc://%C3%B1");
 }
+
+#[test]
+fn non_special_path_starting_with_double_slash_uses_marker() {
+    let url = Url::parse("foo:/.//example/path?query#fragment").unwrap();
+    assert_eq!(url.as_str(), "foo:/.//example/path?query#fragment");
+    assert!(!url.has_authority());
+    assert_eq!(url.host_str(), None);
+    assert_eq!(url.path(), "//example/path");
+    assert_eq!(url.query(), Some("query"));
+    assert_eq!(url.fragment(), Some("fragment"));
+    assert_eq!(&url[Position::AfterPort..Position::BeforePath], "/.");
+    assert_eq!(&url[Position::BeforePath..Position::AfterPath], "//example/path");
+
+    let reparsed = Url::parse(url.as_str()).unwrap();
+    assert_eq!(reparsed.as_str(), url.as_str());
+    assert!(!reparsed.has_authority());
+    assert_eq!(reparsed.host_str(), None);
+    assert_eq!(reparsed.path(), "//example/path");
+}
+
+#[test]
+fn non_special_join_recomputes_double_slash_marker() {
+    let base = Url::parse("foo:/.//a/b?old#frag").unwrap();
+
+    let keeps_double_slash = base.join("c").unwrap();
+    assert_eq!(keeps_double_slash.as_str(), "foo:/.//a/c");
+    assert_eq!(keeps_double_slash.path(), "//a/c");
+    assert_eq!(
+        &keeps_double_slash[Position::AfterPort..Position::BeforePath],
+        "/."
+    );
+
+    let removes_marker = base.join("../c").unwrap();
+    assert_eq!(removes_marker.as_str(), "foo:/c");
+    assert_eq!(removes_marker.path(), "/c");
+    assert_eq!(
+        &removes_marker[Position::AfterPort..Position::BeforePath],
+        ""
+    );
+
+    let query_only = base.join("?new").unwrap();
+    assert_eq!(query_only.as_str(), "foo:/.//a/b?new");
+    assert_eq!(query_only.path(), "//a/b");
+
+    let fragment_only = base.join("#new").unwrap();
+    assert_eq!(fragment_only.as_str(), "foo:/.//a/b?old#new");
+    assert_eq!(fragment_only.path(), "//a/b");
+}
+
+#[test]
+fn marker_is_not_used_for_host_bearing_or_special_urls() {
+    let host_url = Url::parse("foo://host//path").unwrap();
+    assert!(host_url.has_authority());
+    assert_eq!(host_url.path(), "//path");
+    assert_eq!(&host_url[Position::AfterPort..Position::BeforePath], "");
+
+    let special = Url::parse("http://example.com//path").unwrap();
+    assert!(special.has_authority());
+    assert_eq!(special.path(), "//path");
+    assert_eq!(&special[Position::AfterPort..Position::BeforePath], "");
+}
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/tests/unit.rs
The tests now cover direct reparsing, the `AfterPort..BeforePath` slice, relative joins that keep/remove the marker, and the host-bearing/special exclusions. I’m running the targeted test binary before the full locked build so compile or logic errors are easier to isolate.
shell
cargo test -p url --test unit non_special --locked
output
Chunk ID: ec4cec
Wall time: 1.9533 seconds
Process exited with code 101
Original token count: 756
Output:
   Compiling proc-macro2 v1.0.106
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> percent_encoding/src/lib.rs:462:35
    |
462 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
462 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
462 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `percent-encoding` (lib) generated 1 warning
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> form_urlencoded/src/lib.rs:403:35
    |
403 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
403 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
403 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `form_urlencoded` (lib) generated 1 warning
   Compiling url v2.3.1 (/app/url)
   Compiling quote v1.0.45
   Compiling syn v1.0.109
   Compiling debugger_test v0.1.5
    Finished `test` profile [unoptimized + debuginfo] target(s) in 2.07s
     Running tests/unit.rs (target/debug/deps/unit-a494890561398094)

running 5 tests
test non_special_path_starting_with_double_slash_uses_marker ... ok
test non_special_join_recomputes_double_slash_marker ... FAILED
test test_non_special_path ... ok
test test_non_special_path2 ... ok
test test_non_special_path3 ... ok

failures:

---- non_special_join_recomputes_double_slash_marker stdout ----

thread 'non_special_join_recomputes_double_slash_marker' panicked at url/tests/unit.rs:69:5:
assertion `left == right` failed
  left: "foo:/.//c"
 right: "foo:/c"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    non_special_join_recomputes_double_slash_marker

test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 56 filtered out; finished in 0.00s

error: test failed, to rerun pass `-p url --test unit`
The first targeted run compiled and the direct marker tests passed. One join expectation was too aggressive: `../c` from logical `//a/b` still leaves a `//c` logical path, so I’m adjusting that case to also cover `../../c`, which is the parent-directory join that resolves back to a single leading slash.
apply_patch
*** Begin Patch
*** Update File: /app/url/tests/unit.rs
@@
-    let removes_marker = base.join("../c").unwrap();
+    let removes_marker = base.join("../../c").unwrap();
*** End Patch


Exit code: 0
Wall time: 0 seconds
Output:
Success. Updated the following files:
M /app/url/tests/unit.rs
I’ve corrected the test input and am rerunning the focused tests. If these pass, I’ll run a full test/build pass and fix any invariant fallout.
shell
cargo test -p url --test unit non_special --locked
output
Chunk ID: 56be09
Wall time: 0.1617 seconds
Process exited with code 0
Original token count: 614
Output:
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> percent_encoding/src/lib.rs:462:35
    |
462 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
462 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
462 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `percent-encoding` (lib) generated 1 warning
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> form_urlencoded/src/lib.rs:403:35
    |
403 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
403 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
403 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `form_urlencoded` (lib) generated 1 warning
   Compiling url v2.3.1 (/app/url)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.29s
     Running tests/unit.rs (target/debug/deps/unit-a494890561398094)

running 5 tests
test non_special_path_starting_with_double_slash_uses_marker ... ok
test non_special_join_recomputes_double_slash_marker ... ok
test test_non_special_path ... ok
test test_non_special_path2 ... ok
test test_non_special_path3 ... ok

test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 56 filtered out; finished in 0.00s

The focused marker tests pass. I’m formatting now, then I’ll run the requested `cargo build --locked`; if formatting changes anything meaningful I’ll rerun the focused tests afterward.
shell
cargo fmt
output
Chunk ID: 7ac349
Wall time: 0.1648 seconds
Process exited with code 1
Original token count: 35
Output:
error: 'cargo-fmt' is not installed for the toolchain '1.85.1-aarch64-unknown-linux-gnu'.
To install, run `rustup component add rustfmt`
`cargo fmt` is unavailable in this toolchain (`cargo-fmt` is not installed), so I’m proceeding with the locked build and will keep any formatting fixes manual.
shell
cargo build --locked
output
Chunk ID: ab73f2
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 755
Output:
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> percent_encoding/src/lib.rs:462:35
    |
462 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
462 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
462 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `percent-encoding` (lib) generated 1 warning
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> form_urlencoded/src/lib.rs:403:35
    |
403 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
403 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
403 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `form_urlencoded` (lib) generated 1 warning
warning: field `0` is never read
 --> data-url/src/forgiving_base64.rs:4:26
  |
4 | pub struct InvalidBase64(InvalidBase64Details);
  |            ------------- ^^^^^^^^^^^^^^^^^^^^
  |            |
  |            field in this struct
  |
  = help: consider removing this field
  = note: `InvalidBase64` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
  = note: `#[warn(dead_code)]` on by default

warning: field `0` is never read
 --> data-url/src/forgiving_base64.rs:8:22
  |
8 |     UnexpectedSymbol(u8),
  |     ---------------- ^^
  |     |
  |     field in this variant
  |
  = note: `InvalidBase64Details` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
  |
8 |     UnexpectedSymbol(()),
  |                      ~~

warning: `data-url` (lib) generated 2 warnings
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.01s
The requested locked build succeeds; the warnings are pre-existing workspace warnings in other crates. I’m doing one broader `url` crate test run now because this change touches parser invariants and slicing.
shell
cargo test -p url --locked
output
Chunk ID: 2b0cb9
Wall time: 3.7202 seconds
Process exited with code 0
Original token count: 2162
Output:
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> percent_encoding/src/lib.rs:462:35
    |
462 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
462 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
462 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `percent-encoding` (lib) generated 1 warning
warning: ambiguous wide pointer comparison, the comparison includes metadata which may not be expected
   --> form_urlencoded/src/lib.rs:403:35
    |
403 |                     debug_assert!(raw_utf8 == &*bytes as *const [u8]);
    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(ambiguous_wide_pointer_comparisons)]` on by default
help: use `std::ptr::addr_eq` or untyped pointers to only compare their addresses
    |
403 |                     debug_assert!(std::ptr::addr_eq(raw_utf8, &*bytes as *const [u8]));
    |                                   ++++++++++++++++++        ~                       +
help: use explicit `std::ptr::eq` method to compare metadata and addresses
    |
403 |                     debug_assert!(std::ptr::eq(raw_utf8, &*bytes as *const [u8]));
    |                                   +++++++++++++        ~                       +

warning: `form_urlencoded` (lib) generated 1 warning
   Compiling url v2.3.1 (/app/url)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.32s
     Running unittests src/lib.rs (target/debug/deps/url-2559718008fa8f63)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running tests/data.rs (target/debug/deps/data-2c0f19163cfb41ae)

running 2 tests
test setters_tests ... ok
test urltestdata ... ok

test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s

     Running tests/unit.rs (target/debug/deps/unit-a494890561398094)

running 61 tests
test append_empty_segment_then_mutate ... ok
test append_trailing_slash ... ok
test form_urlencoded_encoding_override ... ok
test from_str ... ok
test extend_query_pairs_then_mutate ... ok
test host_serialization ... ok
test issue_124 ... ok
test host ... ok
test issue_197 ... ok
test issue_241 ... ok
test issue_61 ... ok
test marker_is_not_used_for_host_bearing_or_special_urls ... ok
test new_directory_paths ... ok
test new_path_bad_utf8 ... ok
test new_path_windows_fun ... ok
test new_file_paths ... ok
test non_special_join_recomputes_double_slash_marker ... ok
test non_special_path_starting_with_double_slash_uses_marker ... ok
test no_panic ... ok
test parse_with_params ... ok
test path_backslash_fun ... ok
test pop_if_empty_in_bounds ... ok
test size ... ok
test test_domain ... ok
test test_authority ... ok
test test_domain_encoding_quirks ... ok
test test_equality ... ok
test test_form_serialize ... ok
test test_form_urlencoded ... ok
test test_has_authority ... ok
test test_idna ... ok
test test_fragment ... ok
test test_leading_dots ... ok
test test_no_base_url ... ok
test test_non_special_path ... ok
test test_non_special_path2 ... ok
test test_make_relative ... ok
test test_non_special_path3 ... ok
test test_options_reuse ... ok
test test_origin_blob_equality ... ok
test test_origin_hash ... ok
test test_origin_opaque ... ok
test test_query ... ok
test test_relative ... ok
test test_origin_unicode_serialization ... ok
test test_relative_empty ... ok
test test_serialization ... ok
test test_set_empty_host ... ok
test test_set_empty_hostname ... ok
test test_set_href ... ok
test test_set_host ... ok
test test_set_ip_host ... ok
test test_set_scheme_to_file_with_host ... ok
test test_slicing ... ok
test test_strip_trailing_spaces_from_opaque_path ... ok
test test_syntax_violation_callback ... ok
test test_syntax_violation_callback_lifetimes ... ok
test test_syntax_violation_callback_types ... ok
test test_url_from_file_path ... ok
test test_windows_unc_path ... ok
test test_socket_addrs ... ok

test result: ok. 61 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

   Doc-tests url

running 66 tests
test url/src/lib.rs - (line 18) ... ok
test url/src/lib.rs - (line 26) ... ok
test url/src/lib.rs - (line 89) ... ok
test url/src/lib.rs - (line 57) ... ok
test url/src/lib.rs - (line 97) ... ok
test url/src/lib.rs - ParseOptions<'a>::syntax_violation_callback (line 222) ... ok
test url/src/lib.rs - Url::as_str (line 617) ... ok
test url/src/lib.rs - Url::authority (line 928) ... ok
test url/src/lib.rs - Url::cannot_be_a_base (line 964) ... ok
test url/src/lib.rs - Url::domain (line 1167) ... ok
test url/src/lib.rs - Url::from_file_path (line 2448) ... ok
test url/src/lib.rs - Url::fragment (line 1465) ... ok
test url/src/lib.rs - Url::has_authority (line 892) ... ok
test url/src/lib.rs - Url::has_host (line 1059) ... ok
test url/src/lib.rs - Url::host (line 1132) ... ok
test url/src/lib.rs - Url::host_str (line 1093) ... ok
test url/src/lib.rs - Url::into_string (line 640) ... ok
test url/src/lib.rs - Url::join (line 423) ... ok
test url/src/lib.rs - Url::make_relative (line 458) ... ok
test url/src/lib.rs - Url::options (line 590) ... ok
test url/src/lib.rs - Url::origin (line 812) ... ok
test url/src/lib.rs - Url::origin (line 795) ... ok
test url/src/lib.rs - Url::origin (line 829) ... ok
test url/src/lib.rs - Url::origin (line 846) ... ok
test url/src/lib.rs - Url::parse (line 323) ... ok
test url/src/lib.rs - Url::parse_with_params (line 351) ... ok
test url/src/lib.rs - Url::password (line 1021) ... ok
test url/src/lib.rs - Url::path (line 1314) ... ok
test url/src/lib.rs - Url::path_segments (line 1350) ... ok
test url/src/lib.rs - Url::port (line 1198) ... ok
test url/src/lib.rs - Url::query (line 1386) ... ok
test url/src/lib.rs - Url::port_or_known_default (line 1230) ... ok
test url/src/lib.rs - Url::query_pairs_mut (line 1607) ... ok
test url/src/lib.rs - Url::query_pairs (line 1425) ... ok
test url/src/lib.rs - Url::set_fragment (line 1499) ... ok
test url/src/lib.rs - Url::scheme (line 866) ... ok
test url/src/lib.rs - Url::set_host (line 1888) ... ok
test url/src/lib.rs - Url::set_host (line 1872) ... ok
test url/src/lib.rs - Url::set_host (line 1904) ... ok
test url/src/lib.rs - Url::set_host (line 1920) ... ok
test url/src/lib.rs - Url::set_ip_host (line 2078) ... ok
test url/src/lib.rs - Url::set_ip_host (line 2063) ... ok
test url/src/lib.rs - Url::set_password (line 2112) ... ok
test url/src/lib.rs - Url::set_path (line 1669) ... ok
test url/src/lib.rs - Url::set_port (line 1779) ... ok
test url/src/lib.rs - Url::set_port (line 1760) ... ok
test url/src/lib.rs - Url::set_port (line 1795) ... ok
test url/src/lib.rs - Url::set_query (line 1557) ... ok
test url/src/lib.rs - Url::set_scheme (line 2297) ... ok
test url/src/lib.rs - Url::set_scheme (line 2312) ... ok
test url/src/lib.rs - Url::set_scheme (line 2344) ... ok
test url/src/lib.rs - Url::set_scheme (line 2328) ... ok
test url/src/lib.rs - Url::set_scheme (line 2374) ... ok
test url/src/lib.rs - Url::set_scheme (line 2359) ... ok
test url/src/lib.rs - Url::set_username (line 2197) ... ok
test url/src/lib.rs - Url::set_username (line 2212) ... ok
test url/src/lib.rs - Url::socket_addrs (line 1263) - compile ... ok
test url/src/lib.rs - Url::socket_addrs (line 1270) ... ok
test url/src/lib.rs - Url::to_file_path (line 2608) ... ok
test url/src/lib.rs - Url::username (line 991) ... ok
test url/src/path_segments.rs - path_segments::PathSegmentsMut (line 20) ... ok
test url/src/path_segments.rs - path_segments::PathSegmentsMut<'a>::clear (line 80) ... ok
test url/src/path_segments.rs - path_segments::PathSegmentsMut<'a>::extend (line 183) ... ok
test url/src/path_segments.rs - path_segments::PathSegmentsMut<'a>::extend (line 203) ... ok
test url/src/slicing.rs - slicing::Position (line 44) ... ok
test url/src/path_segments.rs - path_segments::PathSegmentsMut<'a>::pop_if_empty (line 108) ... ok

test result: ok. 66 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 3.41s

The broader `url` crate tests pass as well. I’m doing a quick final read of the touched sections so the close-out can point to the exact files and any remaining caveat accurately.
shell
nl -ba url/src/lib.rs | sed -n '300,365p'
output
Chunk ID: 265539
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 611
Output:
   300	                if let Some(ref mut index) = self.fragment_start {
   301	                    *index += "/.".len() as u32;
   302	                }
   303	            }
   304	            (false, Some(marker_start)) => {
   305	                self.serialization
   306	                    .drain(marker_start as usize..self.path_start as usize);
   307	                self.path_start = marker_start;
   308	                if let Some(ref mut index) = self.query_start {
   309	                    *index -= "/.".len() as u32;
   310	                }
   311	                if let Some(ref mut index) = self.fragment_start {
   312	                    *index -= "/.".len() as u32;
   313	                }
   314	            }
   315	            _ => {}
   316	        }
   317	    }
   318	
   319	    /// Parse an absolute URL from a string.
   320	    ///
   321	    /// # Examples
   322	    ///
   323	    /// ```rust
   324	    /// use url::Url;
   325	    /// # use url::ParseError;
   326	    ///
   327	    /// # fn run() -> Result<(), ParseError> {
   328	    /// let url = Url::parse("https://example.net")?;
   329	    /// # Ok(())
   330	    /// # }
   331	    /// # run().unwrap();
   332	    /// ```
   333	    ///
   334	    /// # Errors
   335	    ///
   336	    /// If the function can not parse an absolute URL from the given string,
   337	    /// a [`ParseError`] variant will be returned.
   338	    ///
   339	    /// [`ParseError`]: enum.ParseError.html
   340	    #[inline]
   341	    pub fn parse(input: &str) -> Result<Url, crate::ParseError> {
   342	        Url::options().parse(input)
   343	    }
   344	
   345	    /// Parse an absolute URL from a string and add params to its query string.
   346	    ///
   347	    /// Existing params are not removed.
   348	    ///
   349	    /// # Examples
   350	    ///
   351	    /// ```rust
   352	    /// use url::Url;
   353	    /// # use url::ParseError;
   354	    ///
   355	    /// # fn run() -> Result<(), ParseError> {
   356	    /// let url = Url::parse_with_params("https://example.net?dont=clobberme",
   357	    ///                                  &[("lang", "rust"), ("browser", "servo")])?;
   358	    /// assert_eq!("https://example.net/?dont=clobberme&lang=rust&browser=servo", url.as_str());
   359	    /// # Ok(())
   360	    /// # }
   361	    /// # run().unwrap();
   362	    /// ```
   363	    ///
   364	    /// # Errors
   365	    ///
shell
nl -ba url/src/parser.rs | sed -n '755,825p'
output
Chunk ID: 9cb6d2
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 880
Output:
   755	                            != "//"
   756	                    });
   757	                    let scheme_end = base_url.scheme_end;
   758	                    debug_assert!(base_url.byte_at(scheme_end) == b':');
   759	                    self.serialization
   760	                        .push_str(base_url.slice(..scheme_end + 1));
   761	                    if let Some(after_prefix) = input.split_prefix("//") {
   762	                        return self.after_double_slash(after_prefix, scheme_type, scheme_end);
   763	                    }
   764	                    return self.after_double_slash(remaining, scheme_type, scheme_end);
   765	                }
   766	                let path_start = base_url.path_start_without_marker();
   767	                self.serialization.push_str(base_url.slice(..path_start));
   768	                self.serialization.push('/');
   769	                let remaining = self.parse_path(
   770	                    scheme_type,
   771	                    &mut true,
   772	                    path_start as usize,
   773	                    input_after_first_char,
   774	                );
   775	                self.with_query_and_fragment(
   776	                    scheme_type,
   777	                    base_url.scheme_end,
   778	                    base_url.username_end,
   779	                    base_url.host_start,
   780	                    base_url.host_end,
   781	                    base_url.host,
   782	                    base_url.port,
   783	                    path_start,
   784	                    remaining,
   785	                )
   786	            }
   787	            _ => {
   788	                let path_start = base_url.path_start_without_marker();
   789	                self.serialization.push_str(base_url.slice(..path_start));
   790	                self.serialization.push_str(base_url.path());
   791	                // FIXME spec says just "remove last entry", not the "pop" algorithm
   792	                self.pop_path(scheme_type, path_start as usize);
   793	                // A special url always has a path.
   794	                // A path always starts with '/'
   795	                if self.serialization.len() == path_start as usize
   796	                    && (SchemeType::from(base_url.scheme()).is_special() || !input.is_empty())
   797	                {
   798	                    self.serialization.push('/');
   799	                }
   800	                let remaining = match input.split_first() {
   801	                    (Some('/'), remaining) => self.parse_path(
   802	                        scheme_type,
   803	                        &mut true,
   804	                        path_start as usize,
   805	                        remaining,
   806	                    ),
   807	                    _ => {
   808	                        self.parse_path(scheme_type, &mut true, path_start as usize, input)
   809	                    }
   810	                };
   811	                self.with_query_and_fragment(
   812	                    scheme_type,
   813	                    base_url.scheme_end,
   814	                    base_url.username_end,
   815	                    base_url.host_start,
   816	                    base_url.host_end,
   817	                    base_url.host,
   818	                    base_url.port,
   819	                    path_start,
   820	                    remaining,
   821	                )
   822	            }
   823	        }
   824	    }
   825	
shell
nl -ba url/src/parser.rs | sed -n '1360,1395p'
output
Chunk ID: 22ae8e
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 343
Output:
  1360	        let mut url = Url {
  1361	            serialization: self.serialization,
  1362	            scheme_end,
  1363	            username_end,
  1364	            host_start,
  1365	            host_end,
  1366	            host,
  1367	            port,
  1368	            path_start,
  1369	            query_start,
  1370	            fragment_start,
  1371	        };
  1372	        url.ensure_non_special_path_marker();
  1373	        Ok(url)
  1374	    }
  1375	
  1376	    /// Return (query_start, fragment_start)
  1377	    fn parse_query_and_fragment(
  1378	        &mut self,
  1379	        scheme_type: SchemeType,
  1380	        scheme_end: u32,
  1381	        mut input: Input<'_>,
  1382	    ) -> ParseResult<(Option<u32>, Option<u32>)> {
  1383	        let mut query_start = None;
  1384	        match input.next() {
  1385	            Some('#') => {}
  1386	            Some('?') => {
  1387	                query_start = Some(to_u32(self.serialization.len())?);
  1388	                self.serialization.push('?');
  1389	                let remaining = self.parse_query(scheme_type, scheme_end, input);
  1390	                if let Some(remaining) = remaining {
  1391	                    input = remaining
  1392	                } else {
  1393	                    return Ok((query_start, None));
  1394	                }
  1395	            }
shell
nl -ba url/src/slicing.rs | sed -n '145,158p'
output
Chunk ID: ea5f3a
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 161
Output:
   145	                    debug_assert!(self.byte_at(self.host_end) == b':');
   146	                    self.host_end as usize + ":".len()
   147	                } else {
   148	                    self.host_end as usize
   149	                }
   150	            }
   151	
   152	            Position::AfterPort => self.path_start_without_marker() as usize,
   153	
   154	            Position::BeforePath => self.path_start as usize,
   155	
   156	            Position::AfterPath => match (self.query_start, self.fragment_start) {
   157	                (Some(q), _) => q as usize,
   158	                (None, Some(f)) => f as usize,
shell
nl -ba url/tests/unit.rs | sed -n '35,100p'
output
Chunk ID: 9e0100
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 722
Output:
    35	}
    36	
    37	#[test]
    38	fn non_special_path_starting_with_double_slash_uses_marker() {
    39	    let url = Url::parse("foo:/.//example/path?query#fragment").unwrap();
    40	    assert_eq!(url.as_str(), "foo:/.//example/path?query#fragment");
    41	    assert!(!url.has_authority());
    42	    assert_eq!(url.host_str(), None);
    43	    assert_eq!(url.path(), "//example/path");
    44	    assert_eq!(url.query(), Some("query"));
    45	    assert_eq!(url.fragment(), Some("fragment"));
    46	    assert_eq!(&url[Position::AfterPort..Position::BeforePath], "/.");
    47	    assert_eq!(&url[Position::BeforePath..Position::AfterPath], "//example/path");
    48	
    49	    let reparsed = Url::parse(url.as_str()).unwrap();
    50	    assert_eq!(reparsed.as_str(), url.as_str());
    51	    assert!(!reparsed.has_authority());
    52	    assert_eq!(reparsed.host_str(), None);
    53	    assert_eq!(reparsed.path(), "//example/path");
    54	}
    55	
    56	#[test]
    57	fn non_special_join_recomputes_double_slash_marker() {
    58	    let base = Url::parse("foo:/.//a/b?old#frag").unwrap();
    59	
    60	    let keeps_double_slash = base.join("c").unwrap();
    61	    assert_eq!(keeps_double_slash.as_str(), "foo:/.//a/c");
    62	    assert_eq!(keeps_double_slash.path(), "//a/c");
    63	    assert_eq!(
    64	        &keeps_double_slash[Position::AfterPort..Position::BeforePath],
    65	        "/."
    66	    );
    67	
    68	    let removes_marker = base.join("../../c").unwrap();
    69	    assert_eq!(removes_marker.as_str(), "foo:/c");
    70	    assert_eq!(removes_marker.path(), "/c");
    71	    assert_eq!(
    72	        &removes_marker[Position::AfterPort..Position::BeforePath],
    73	        ""
    74	    );
    75	
    76	    let query_only = base.join("?new").unwrap();
    77	    assert_eq!(query_only.as_str(), "foo:/.//a/b?new");
    78	    assert_eq!(query_only.path(), "//a/b");
    79	
    80	    let fragment_only = base.join("#new").unwrap();
    81	    assert_eq!(fragment_only.as_str(), "foo:/.//a/b?old#new");
    82	    assert_eq!(fragment_only.path(), "//a/b");
    83	}
    84	
    85	#[test]
    86	fn marker_is_not_used_for_host_bearing_or_special_urls() {
    87	    let host_url = Url::parse("foo://host//path").unwrap();
    88	    assert!(host_url.has_authority());
    89	    assert_eq!(host_url.path(), "//path");
    90	    assert_eq!(&host_url[Position::AfterPort..Position::BeforePath], "");
    91	
    92	    let special = Url::parse("http://example.com//path").unwrap();
    93	    assert!(special.has_authority());
    94	    assert_eq!(special.path(), "//path");
    95	    assert_eq!(&special[Position::AfterPort..Position::BeforePath], "");
    96	}
    97	
    98	#[test]
    99	fn test_strip_trailing_spaces_from_opaque_path() {
   100	    let mut url: Url = "data:space   ?query".parse().unwrap();
The final read looks consistent: marker insertion is centralized, joins use the unmarked path boundary for resolution, and slicing exposes the marker gap. I’m collecting line references for the final summary.
shell
nl -ba url/src/lib.rs | sed -n '250,320p'
output
Chunk ID: e49416
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 731
Output:
   250	            context: Context::UrlParser,
   251	        }
   252	        .parse_url(input)
   253	    }
   254	}
   255	
   256	impl Url {
   257	    fn has_no_authority_components(&self) -> bool {
   258	        let scheme_end = self.scheme_end + ":".len() as u32;
   259	        self.username_end == scheme_end
   260	            && self.host_start == scheme_end
   261	            && self.host_end == scheme_end
   262	            && self.host == HostInternal::None
   263	            && self.port.is_none()
   264	    }
   265	
   266	    pub(crate) fn path_marker_start(&self) -> Option<u32> {
   267	        if SchemeType::from(self.scheme()).is_special()
   268	            || !self.has_no_authority_components()
   269	            || self.path_start < "/.".len() as u32
   270	        {
   271	            return None;
   272	        }
   273	
   274	        let marker_start = self.path_start - "/.".len() as u32;
   275	        if self.slice(marker_start..self.path_start) == "/." && self.path().starts_with("//") {
   276	            Some(marker_start)
   277	        } else {
   278	            None
   279	        }
   280	    }
   281	
   282	    pub(crate) fn path_start_without_marker(&self) -> u32 {
   283	        self.path_marker_start().unwrap_or(self.path_start)
   284	    }
   285	
   286	    pub(crate) fn ensure_non_special_path_marker(&mut self) {
   287	        let marker_start = self.path_marker_start();
   288	        let needs_marker = !SchemeType::from(self.scheme()).is_special()
   289	            && self.has_no_authority_components()
   290	            && self.path().starts_with("//");
   291	
   292	        match (needs_marker, marker_start) {
   293	            (true, None) => {
   294	                self.serialization
   295	                    .insert_str(self.path_start as usize, "/.");
   296	                self.path_start += "/.".len() as u32;
   297	                if let Some(ref mut index) = self.query_start {
   298	                    *index += "/.".len() as u32;
   299	                }
   300	                if let Some(ref mut index) = self.fragment_start {
   301	                    *index += "/.".len() as u32;
   302	                }
   303	            }
   304	            (false, Some(marker_start)) => {
   305	                self.serialization
   306	                    .drain(marker_start as usize..self.path_start as usize);
   307	                self.path_start = marker_start;
   308	                if let Some(ref mut index) = self.query_start {
   309	                    *index -= "/.".len() as u32;
   310	                }
   311	                if let Some(ref mut index) = self.fragment_start {
   312	                    *index -= "/.".len() as u32;
   313	                }
   314	            }
   315	            _ => {}
   316	        }
   317	    }
   318	
   319	    /// Parse an absolute URL from a string.
   320	    ///
shell
nl -ba url/src/lib.rs | sed -n '660,705p'
output
Chunk ID: 40b570
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 522
Output:
   660	    /// Methods of the `Url` struct assume a number of invariants.
   661	    /// This checks each of these invariants and panic if one is not met.
   662	    /// This is for testing rust-url itself.
   663	    #[doc(hidden)]
   664	    pub fn check_invariants(&self) -> Result<(), String> {
   665	        macro_rules! assert {
   666	            ($x: expr) => {
   667	                if !$x {
   668	                    return Err(format!(
   669	                        "!( {} ) for URL {:?}",
   670	                        stringify!($x),
   671	                        self.serialization
   672	                    ));
   673	                }
   674	            };
   675	        }
   676	
   677	        macro_rules! assert_eq {
   678	            ($a: expr, $b: expr) => {
   679	                {
   680	                    let a = $a;
   681	                    let b = $b;
   682	                    if a != b {
   683	                        return Err(format!("{:?} != {:?} ({} != {}) for URL {:?}",
   684	                                           a, b, stringify!($a), stringify!($b),
   685	                                           self.serialization))
   686	                    }
   687	                }
   688	            }
   689	        }
   690	
   691	        assert!(self.scheme_end >= 1);
   692	        assert!(self.byte_at(0).is_ascii_alphabetic());
   693	        assert!(self
   694	            .slice(1..self.scheme_end)
   695	            .chars()
   696	            .all(|c| matches!(c, 'a'..='z' | 'A'..='Z' | '0'..='9' | '+' | '-' | '.')));
   697	        assert_eq!(self.byte_at(self.scheme_end), b':');
   698	
   699	        if self.has_authority() {
   700	            // URL with authority
   701	            if self.username_end != self.serialization.len() as u32 {
   702	                match self.byte_at(self.username_end) {
   703	                    b':' => {
   704	                        assert!(self.host_start >= self.username_end + 2);
   705	                        assert_eq!(self.byte_at(self.host_start - 1), b'@');
shell
nl -ba url/src/lib.rs | sed -n '1640,1675p'
output
Chunk ID: 64f946
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 331
Output:
  1640	            query_start = start as usize;
  1641	        } else {
  1642	            query_start = self.serialization.len();
  1643	            self.query_start = Some(to_u32(query_start).unwrap());
  1644	            self.serialization.push('?');
  1645	        }
  1646	
  1647	        let query = UrlQuery {
  1648	            url: Some(self),
  1649	            fragment,
  1650	        };
  1651	        form_urlencoded::Serializer::for_suffix(query, query_start + "?".len())
  1652	    }
  1653	
  1654	    fn take_after_path(&mut self) -> String {
  1655	        match (self.query_start, self.fragment_start) {
  1656	            (Some(i), _) | (None, Some(i)) => {
  1657	                let after_path = self.slice(i..).to_owned();
  1658	                self.serialization.truncate(i as usize);
  1659	                after_path
  1660	            }
  1661	            (None, None) => String::new(),
  1662	        }
  1663	    }
  1664	
  1665	    /// Change this URL’s path.
  1666	    ///
  1667	    /// # Examples
  1668	    ///
  1669	    /// ```rust
  1670	    /// use url::Url;
  1671	    /// # use url::ParseError;
  1672	    ///
  1673	    /// # fn run() -> Result<(), ParseError> {
  1674	    /// let mut url = Url::parse("https://example.com")?;
  1675	    /// url.set_path("api/comments");
shell
nl -ba url/src/path_segments.rs | sed -n '60,72p'
output
Chunk ID: 60f1b0
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 94
Output:
    60	        old_after_path_position,
    61	        after_path,
    62	    }
    63	}
    64	
    65	impl<'a> Drop for PathSegmentsMut<'a> {
    66	    fn drop(&mut self) {
    67	        self.url.ensure_non_special_path_marker();
    68	        self.url
    69	            .restore_after_path(self.old_after_path_position, &self.after_path)
    70	    }
    71	}
    72	
shell
nl -ba url/src/lib.rs | sed -n '1700,1738p'
output
Chunk ID: cc13fe
Wall time: 0.0000 seconds
Process exited with code 0
Original token count: 483
Output:
  1700	    pub fn set_path(&mut self, mut path: &str) {
  1701	        let after_path = self.take_after_path();
  1702	        let old_after_path_pos = to_u32(self.serialization.len()).unwrap();
  1703	        let cannot_be_a_base = self.cannot_be_a_base();
  1704	        let scheme_type = SchemeType::from(self.scheme());
  1705	        let path_start = self.path_start_without_marker();
  1706	        self.serialization.truncate(path_start as usize);
  1707	        self.path_start = path_start;
  1708	        self.mutate(|parser| {
  1709	            if cannot_be_a_base {
  1710	                if path.starts_with('/') {
  1711	                    parser.serialization.push_str("%2F");
  1712	                    path = &path[1..];
  1713	                }
  1714	                parser.parse_cannot_be_a_base_path(parser::Input::new(path));
  1715	            } else {
  1716	                let mut has_host = true; // FIXME
  1717	                parser.parse_path_start(scheme_type, &mut has_host, parser::Input::new(path));
  1718	            }
  1719	        });
  1720	        self.ensure_non_special_path_marker();
  1721	        self.restore_after_path(old_after_path_pos, &after_path);
  1722	    }
  1723	
  1724	    /// Return an object with methods to manipulate this URL’s path segments.
  1725	    ///
  1726	    /// Return `Err(())` if this URL is cannot-be-a-base.
  1727	    #[allow(clippy::result_unit_err)]
  1728	    pub fn path_segments_mut(&mut self) -> Result<PathSegmentsMut<'_>, ()> {
  1729	        if self.cannot_be_a_base() {
  1730	            Err(())
  1731	        } else {
  1732	            Ok(path_segments::new(self))
  1733	        }
  1734	    }
  1735	
  1736	    fn restore_after_path(&mut self, old_after_path_position: u32, after_path: &str) {
  1737	        let new_after_path_position = to_u32(self.serialization.len()).unwrap();
  1738	        let adjust = |index: &mut u32| {
Implemented the non-special `//` logical path marker behavior. Changed: - Added private marker handling in [url/src/lib.rs](/app/url/src/lib.rs:256), keeping `/.` serialized while `path()` starts at the logical path. - Recomputed marker state after parsing and relative path joins in [url/src/parser.rs](/app/url/src/parser.rs:766) and [url/src/parser.rs](/app/url/src/parser.rs:1360). - Kept `Position::AfterPort` before the marker and `Position::BeforePath` after it in [url/src/slicing.rs](/app/url/src/slicing.rs:152). - Updated path mutation paths to preserve/remove the marker correctly in [url/src/lib.rs](/app/url/src/lib.rs:1700) and [url/src/path_segments.rs](/app/url/src/path_segments.rs:65). - Added unit coverage in [url/tests/unit.rs](/app/url/tests/unit.rs:38). Verification: - `cargo build --locked` passes. - `cargo test -p url --locked` passes. - `cargo fmt` could not run because `cargo-fmt` is not installed for the active toolchain.
Final diff , what the agent changed

No file changes, the agent left the workspace untouched.

Verifier output , the proof behind the reward
tests/test.sh
============================= test session starts ==============================
platform linux -- Python 3.11.2, pytest-8.3.3, pluggy-1.6.0 -- /opt/test-venv/bin/python3
cachedir: .pytest_cache
rootdir: /tests
collecting ... collected 4 items

../tests/test_outputs.py::test_url_roundtrip_suite_passes PASSED         [ 25%]
../tests/test_outputs.py::test_existing_url_unit_tests_still_pass PASSED [ 50%]
../tests/test_outputs.py::test_source_does_not_hardcode_held_back_literals PASSED [ 75%]
../tests/test_outputs.py::test_vendored_url_data_does_not_leak_hidden_rows PASSED [100%]

==================================== PASSES ====================================
=========================== short test summary info ============================
PASSED ../tests/test_outputs.py::test_url_roundtrip_suite_passes
PASSED ../tests/test_outputs.py::test_existing_url_unit_tests_still_pass
PASSED ../tests/test_outputs.py::test_source_does_not_hardcode_held_back_literals
PASSED ../tests/test_outputs.py::test_vendored_url_data_does_not_leak_hidden_rows
============================== 4 passed in 0.22s ===============================

Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_b22adfc7c57f4de9. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.

Trial trial_b22adfc7c57f4de9 · verifier authoritative; classifier explanatory.