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Stuart Cook 17c25e4483
Rollup merge of #148872 - ShoyuVanilla:issue-148192, r=chenyukang 
fix: Do not ICE when missing match arm with ill-formed subty is met

Fixes rust-lang/rust#148192

The ICE comes from the following line, calling `normalize_erasing_regions` to a projection type whose trait bound is not met:
2fcbda6c1a/compiler/rustc_pattern_analysis/src/rustc.rs (L185-L194)

The above function is called while trying to lint missing match arms, or scrutinize ctors of missing(not necessary error) match arms.

So, the following code can trigger ICEs.
```rust
trait WhereTrait {
    type Type;
}

fn foo(e: Enum) {
    match e {
        Enum::Map(_) => (), // ICE, while trying to lint missing arms
    }

    if let Enum::Map(_) = e {} // ICE, while trying to scrutinize missing ctors (even worse)
}

enum Enum {
    Map(()),
    Map2(<() as WhereTrait>::Type),
}
```

This ICE won't be triggered with the following code, as this is filtered out before `check_match` as the existence of ill-formed type inside the variant marks the body as tainted by error in `hir_typeck`, but for the above code, the `hir_typeck` complains nothing because everything it sees is locally correct.

```rust
fn foo(e: Enum) {
    match e {
        Enum::Map2(_) => (), // No ICE
    }
}
```

I've considered visiting and wf checking for the match scrutinee before entering `check_match`, but that might regress the perf and I think just emitting delayed bug would enough as the normalization failure would be originated by other errors like ill-formdness.
2025-11-13 11:57:10 +11:00
.github Change default branch to main 2025-11-10 10:21:34 +01:00
compiler Rollup merge of #148872 - ShoyuVanilla:issue-148192, r=chenyukang 2025-11-13 11:57:10 +11:00
library Remove more #[must_use] from portable-simd 2025-11-11 13:27:04 -08:00
LICENSES Synchronize Unicode license text from unicode.org 2024-11-20 00:54:12 -08:00
src Rollup merge of #147701 - lolbinarycat:rustdoc-search-alias-fix, r=GuillaumeGomez 2025-11-13 11:57:07 +11:00
tests Rollup merge of #148872 - ShoyuVanilla:issue-148192, r=chenyukang 2025-11-13 11:57:10 +11:00
.clang-format Add .clang-format 2024-06-26 05:56:00 +08:00
.editorconfig editorconfig: don't use nonexistant syntax 2025-08-24 10:37:19 -05:00
.git-blame-ignore-revs git: ignore 60600a6fa4 for blame purposes 2025-04-17 11:50:24 +08:00
.gitattributes Mark .pp files as Rust 2025-03-29 12:39:06 +01:00
.gitignore Ignore test-dashboard related files 2025-10-17 13:40:27 +02:00
.gitmodules Update to LLVM 21 2025-08-01 10:17:04 +02:00
.ignore change config.toml to bootstrap.toml for bootstrap module 2025-03-17 12:56:41 +05:30
.mailmap Rollup merge of #148722 - CAD97:git-dislikes-my-emoji, r=Mark-Simulacrum 2025-11-09 17:37:07 +01:00
bootstrap.example.toml Run the lldb_batchmode.py script in LLDB's embedded Python 2025-11-08 21:08:02 +11:00
Cargo.lock Fix building rustdoc and clippy with jemalloc feature 2025-11-11 20:16:16 +01:00
Cargo.toml Bump Clippy version -> 0.1.93 2025-10-31 18:58:42 +01:00
CODE_OF_CONDUCT.md Remove the code of conduct; instead link https://www.rust-lang.org/conduct.html 2019-10-05 22:55:19 +02:00
configure Ensure ./configure works when configure.py path contains spaces 2024-02-16 18:57:22 +00:00
CONTRIBUTING.md chore: remove dead links 2025-09-22 10:15:50 +01:00
COPYRIGHT dist: Re-work how we describe the licence of Rust in our distributions 2024-12-09 10:18:55 +00:00
INSTALL.md mention about x.py setup in INSTALL.md 2025-04-24 09:15:53 +03:00
LICENSE-APACHE Remove appendix from LICENCE-APACHE 2019-12-30 14:25:53 +00:00
license-metadata.json Update license metadata 2025-02-15 16:48:37 +01:00
LICENSE-MIT dist: Re-work how we describe the licence of Rust in our distributions 2024-12-09 10:18:55 +00:00
package-lock.json Remove eslint-js from npm dependencies 2025-11-07 23:08:28 +01:00
package.json Remove eslint-js from npm dependencies 2025-11-07 23:08:28 +01:00
README.md Update Rust Foundation links in Readme 2025-03-16 19:03:40 -07:00
RELEASES.md update release notes 2025-11-06 20:24:37 +01:00
REUSE.toml REUSE.toml: add new package.json and package-lock.json 2025-07-19 14:44:16 -05:00
rust-bors.toml Add t- prefix to S-waiting-on-{team} labels 2025-10-07 18:15:02 +02:00
rustfmt.toml Rename tests/codegen into tests/codegen-llvm 2025-07-22 14:28:48 +02:00
triagebot.toml Change default branch to main 2025-11-10 10:21:34 +01:00
typos.toml chore: Update typos to 1.38.1 2025-10-20 12:20:15 -06:00
x fix ./x readdir logic when CDPATH is set 2025-09-19 16:48:05 +02:00
x.ps1 use & instead of start-process in x.ps1 2023-12-09 09:46:16 -05:00
x.py Reformat Python code with ruff 2024-12-04 23:03:44 +01:00

README.md

This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.

Why Rust?

  • Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrated with other languages.

  • Reliability: Our rich type system and ownership model ensure memory and thread safety, reducing bugs at compile-time.

  • Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).

Quick Start

Read "Installation" from The Book.

Installing from Source

If you really want to install from source (though this is not recommended), see INSTALL.md.

Getting Help

See https://www.rust-lang.org/community for a list of chat platforms and forums.

Contributing

See CONTRIBUTING.md.

License

Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.

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The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").

If you want to use these names or brands, please read the Rust language trademark policy.

Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.