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Issues: rust-lang/rust

Draft release notes for 1.88.0
#141598 opened May 26, 2025 by Mark-Simulacrum
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Issues list

Can't match strings in consts, but can match byte strings in consts A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-patterns Relating to patterns and pattern matching A-str Area: str and String C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141231 opened May 18, 2025 by clarfonthey
2
Destructuring tuple structs with public leading fields and private trailing fields by tuple syntax is disallowed A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. needs-triage This issue may need triage. Remove it if it has been sufficiently triaged.
#139972 opened Apr 17, 2025 by SOF3
[Optimization] Significantly different assembly output for logically equivalent match patterns with string comparisons A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-patterns Relating to patterns and pattern matching C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139784 opened Apr 14, 2025 by ZhonghaoPan-nju
4
Optimize const pattern guards for StructuralEq types A-patterns Relating to patterns and pattern matching C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138664 opened Mar 18, 2025 by TimNN
unused_assignments lint has trouble tracking that one match guard observes assignment from another match guard. A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. L-false-positive Lint: False positive (should not have fired). L-unused_assignments Lint: unused_assignments T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138069 opened Mar 5, 2025 by pnkfelix
2
Too conservative lifetime check in match arm with if condition. A-borrow-checker Area: The borrow checker A-lifetimes Area: Lifetimes / regions A-patterns Relating to patterns and pattern matching C-enhancement Category: An issue proposing an enhancement or a PR with one. T-types Relevant to the types team, which will review and decide on the PR/issue.
#137878 opened Mar 2, 2025 by sswybd
internal compiler error: two identical projections A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#137467 opened Feb 23, 2025 by HomelikeBrick42
1
@meithecatte
10
Tracking Issue for generic pattern types A-patterns Relating to patterns and pattern matching B-experimental Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize). C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-lang Relevant to the language team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#136574 opened Feb 5, 2025 by oli-obk
4 tasks
2
Terse parse error on ident @ pat in destructuring assignment A-diagnostics Area: Messages for errors, warnings, and lints A-parser Area: The lexing & parsing of Rust source code to an AST A-patterns Relating to patterns and pattern matching D-terse Diagnostics: An error or lint that doesn't give enough information about the problem at hand. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#134778 opened Dec 26, 2024 by workingjubilee
1
Compilation error when matching reference to empty enum A-exhaustiveness-checking Relating to exhaustiveness / usefulness checking of patterns A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. F-exhaustive_patterns `#![feature(exhaustive_patterns)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-opsem Relevant to the opsem team T-types Relevant to the types team, which will review and decide on the PR/issue.
#131452 opened Oct 9, 2024 by dhedey
@Nadrieril
26
High memory usage with cargo build in match statement A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. I-compilemem Issue: Problems and improvements with respect to memory usage during compilation. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131410 opened Oct 8, 2024 by Joshix-1
6
match &[first, ..more] leads down a suggestion garden path A-diagnostics Area: Messages for errors, warnings, and lints A-patterns Relating to patterns and pattern matching A-resolve Area: Name/path resolution done by `rustc_resolve` specifically A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix` D-invalid-suggestion Diagnostics: A structured suggestion resulting in incorrect code. D-papercut Diagnostics: An error or lint that needs small tweaks. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130639 opened Sep 20, 2024 by nabijaczleweli
2
Reconsider Rule 4E (early) for RFC 3627 A-patterns Relating to patterns and pattern matching C-discussion Category: Discussion or questions that doesn't represent real issues. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#130501 opened Sep 18, 2024 by Nadrieril
5
unreachable_pattern could get more specific if the preempting pattern resembles a const A-diagnostics Area: Messages for errors, warnings, and lints A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. L-unreachable_patterns Lint: unreachable_patterns T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129631 opened Aug 26, 2024 by vDorst
7
Inefficient Match Statement Optimization for Unit-Only Enums with Fixed Offsets A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-patterns Relating to patterns and pattern matching C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129131 opened Aug 15, 2024 by Shadowcat650
3
mut in slice pattern: [_, mut @ ..] = &[...] is not needed? A-diagnostics Area: Messages for errors, warnings, and lints A-patterns Relating to patterns and pattern matching A-slice-patterns Area: Slice patterns, https://github.com/rust-lang/rust/issues/23121 T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#126676 opened Jun 19, 2024 by ptrca
2
ICE: dead: non-ADT in struct pattern A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125323 opened May 20, 2024 by matthiaskrgr
1
@Shunpoco
6
Pattern matching reborrowing A-patterns Relating to patterns and pattern matching C-discussion Category: Discussion or questions that doesn't represent real issues. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#123543 opened Apr 6, 2024 by Ddystopia
Tracking Issue for match ergonomics 2024 (RFC 3627) A-patterns Relating to patterns and pattern matching B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-lang Relevant to the language team, which will review and decide on the PR/issue.
#123076 opened Mar 26, 2024 by Jules-Bertholet
8 of 14 tasks
@Jules-Bertholet
15
Further improve diagnostics for expressions in pattern position A-diagnostics Area: Messages for errors, warnings, and lints A-parser Area: The lexing & parsing of Rust source code to an AST A-patterns Relating to patterns and pattern matching D-newcomer-roadblock Diagnostics: Confusing error or lint; hard to understand for new users. D-terse Diagnostics: An error or lint that doesn't give enough information about the problem at hand. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121697 opened Feb 27, 2024 by fmease
8 of 11 tasks
@ShE3py
3
Check for "constants we match on must be PartialEq" misses lifetime-dependent impls A-lifetimes Area: Lifetimes / regions A-patterns Relating to patterns and pattern matching A-trait-system Area: Trait system C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#121007 opened Feb 13, 2024 by RalfJung
3
(..=0 | 2) in macro does not compile without parentheses but generates warning for unnecessary parentheses A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) A-patterns Relating to patterns and pattern matching A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix` C-bug Category: This is a bug. D-invalid-suggestion Diagnostics: A structured suggestion resulting in incorrect code. L-unused_parens Lint: unused_parens T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#120737 opened Feb 7, 2024 by astra90x
2
#[non_exhaustive] stucts can be matched exhaustively using constants as patterns A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. F-non_exhaustive `#![feature(non_exhaustive)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#119264 opened Dec 23, 2023 by Skgland
6
Attributes within patterns do not work if there is another attribute in the same pattern or above A-attributes Area: Attributes (`#[…]`, `#![…]`) A-patterns Relating to patterns and pattern matching C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#118682 opened Dec 6, 2023 by xinyufort
3
Logically identical code. One compiles, one does not A-diagnostics Area: Messages for errors, warnings, and lints A-patterns Relating to patterns and pattern matching C-enhancement Category: An issue proposing an enhancement or a PR with one. D-papercut Diagnostics: An error or lint that needs small tweaks. E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. E-help-wanted Call for participation: Help is requested to fix this issue. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#116572 opened Oct 9, 2023 by schneems
1
@Kohei316
10
ProTip! Find all open issues with in progress development work with linked:pr.