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Author SHA1 Message Date
4955eac958 fix(rust): use bindings follow Rust's scopes, and module paths walk the crate's modules (#3014)
A bare Rust name took the file's `use`s all at once: a `use` inside one
function (`fn first() { use crate::util::take; take() }`) bound `take` for
every other function too, and for the file's own `fn take`; a renamed one
(`use crate::util::take as consume; consume()`) linked nothing, since no
item carries the alias; a parameter or closure of the function's name
(`fn run(take: fn()) { take() }`, `let take = || {};`) linked to the
imported function; and `use crate::models::E::Good; Good(1)` took any
`E::Good`. Paths through modules (`resolveRustPathReference`) walked the
directories instead of the modules: `super::helper()` and `crate::config()`
with no module between linked nothing, `super` inside an inline
`mod tests { }` went to the parent directory's module, and an item a module
passes on (`pub use`, a glob) or another workspace crate's was not found.

The fix keeps one `use` reader, rustUsesOf:
- each `use` keeps the block it is written in (a function's body or a
  block; an inline `mod` and a macro's braces, `cfg_if!`'s nested ones
  included, are the module's), and std `use`s are kept by position;
- a reference reads the binding of its innermost scope (rustVisibleUse);
  isRustNameInScope uses it, so a block's `use` shadows the file's own item
  and a variant `use` names its enum's variant (rustUsePathItems' enum tail);
- matchRustUseBoundName, ahead of the pre-filter, resolves a rename to the
  item its path names, and a call to a name a local binds (rust-scopes'
  bindings, nearer than any `use`) to nothing, unless the local is a `let`
  holding a function by its path (serde's `let test = test::<i8>;`);
- resolveRustPathReference is rustWalkModules + rustModuleItems from the
  module the path is written in (rustPathTarget), with today's crate-root
  fallback; resolveRustModuleFile, collectRustUseBindings and
  rustItemPlacement are gone, and isBoundToOutOfRepoImport reads
  rustUsesOf's std `use`s;
- `use`s are read with strings blanked (blankRustCode), so a string's
  "use crate::x;" binds nothing;
- the crate graph reads a package's name by its section (axum-core writes
  `categories = [..]` first) and a `[lib]`/`[[bin]]` path of its own
  (ripgrep's `crates/core/main.rs`), which `crate::` then starts from; a
  file no manifest covers starts it from the nearest lib.rs or main.rs
  above it, as the directory walk did.

Validation:
- rust-use-call.test.ts (PR 2308's 15 cases), rust-use-scopes.test.ts,
  rust-crate-roots.test.ts and 5 new rust-module-path-call cases: on main's
  source 18 of 32 fail; all pass. Every rust-* suite passes.
- A/B on main 01e0ac3a, 7 repos, the same sites on the kernel and on wasm:
  tokio +2,434 sites (1,354 calls, 1,053 imports), 159 removed (152 locals
  called or passed as values, 6 `Result`s std's, 1 import through a path
  attribute module); ripgrep +248 / -149; axum +710 / -60; clap +730 / -112;
  serde +155 / -207 (192 calls to a closure named `test`); dioxus
  +2,950 / -272; gleam +1,573 / -359. Groups and samples inspected, every
  changed site's crate checked against the manifests' dependencies;
  express and flask byte-identical.
- Cost (kernel, medians of 3 interleaved): tokio CPU 34.5 -> 33.0 s, peak
  RSS 991 -> 1,007 MB; gleam 32.5 -> 30.6 s, 1,022 -> 1,012 MB; dioxus
  45.4 -> 45.4 s, 1,101 -> 1,107 MB.
- Original PR #2308 by @danusha2345; its module-path part landed as PR #2955.

Co-authored-by: danusha2345 <ewidusoc498@gmail.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-29 18:39:13 +00:00
danusha2345andClaude Opus 5.5 3f8e8b0f65 fix(rust): a module-path call links the function its module declares
A Rust path into a module, `crate::util::take(1)`, `super::util::take(1)`,
`util::take(1)` or a `use crate::util::take;`, went to the first node of
that name in the module's file, methods included, so an `impl Buf { fn
take }` above `pub fn take` caught every such call. A function written
inside another function, or in a `mod tests { ... }` above the module's
own item, could take it too, a path into the module's own file linked
nothing, and a path through a module a `use` takes from the standard
library (`fs::read` under `use std::fs;`) went to the project's own `fs`
module.

The path's item is now the module's own: never a method, an impl's or a
trait's associated item, or an item of a function body; one written at
the file's top level before one in a module the file declares inline,
which the path reaches through the module's re-export (`#[cfg(unix)] mod
imp { ... }` + `pub use imp::*;`). A path whose head a `use` binds from
the standard library is left to it (main's isBoundToOutOfRepoImport rule
for bare names), and a path into the module's own file resolves.

Validation:
- rust-module-path-call.test.ts: 8/8; on main 7 fail (method Buf::take,
  Deep::get, Only::grab, no import edge, the inline-module namesake, the
  re-export from its own file, std `fs::read` -> src/fs/mod.rs).
- A/B on main 7cceba52, 6 Rust repos: 162 changed sites, all inspected and
  right. gleam: 133 calls like `fs::write(...)` / `crate::fs::mkdir(...)` move
  from `impl ... for ProjectIO`'s methods to compiler-cli's free functions,
  4 wrong `type_::list(...)` -> `Type::list` edges are gone, 15 `use`s link;
  tokio: `crate::io::uring::open::open(...)` moves from `Op::open` to the free
  `open`, +4; dioxus +7, 1 more; ripgrep +1; clap and serde unchanged.
  express and flask byte-identical.
- Cost (medians of 3 interleaved runs): tokio CPU 36.6 -> 36.0 s, gleam
  34.3 -> 35.2 s, both within the runs' spread; peak RSS unchanged. In a
  CPU profile of tokio the changed functions take under 0.1 s. The
  standard-library check reads the file's `use`s, so it runs only when the
  path would otherwise link a project item (asked for every path, it cost
  0.3 s on tokio).

This is the separable part of PR #2308. Its bare-call bindings (`as`
aliases, block-local `use`, shadowing by locals, enum variants through a
`use`) and the second `use` parser it adds are left out: main's `use` walk
(rustUsesOf, rustWalkModules, rustModuleItems) and scope reader
(rust-scopes.ts) cover the same ground, and folding those cases into them
is proposed separately.

Original PR #2308 by @danusha2345.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-28 00:34:51 +00:00