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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

rustc thinks that two non-intersecting borrows intersect. And fails compilation A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. fixed-by-polonius Compiling with `-Zpolonius` fixes this issue.
#139930 opened Apr 16, 2025 by USSURATONCACHI
2
strange cannot move out of a mutable reference error A-borrow-checker Area: The borrow checker A-clippy Area: Clippy A-diagnostics Area: Messages for errors, warnings, and lints D-lack-of-suggestion Diagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic. L-false-positive Lint: False positive (should not have fired). T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139670 opened Apr 11, 2025 by Sherlock-Holo
2
ICE: assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32' A-borrow-checker Area: The borrow checker A-error-handling Area: Error handling A-frontend Area: Compiler frontend (errors, parsing and HIR) A-parser Area: The lexing & parsing of Rust source code to an AST 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-bisection Status: A bisection has been found for this issue 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.
#139089 opened Mar 28, 2025 by matthiaskrgr
3
Lifetime must be 'static, but why? A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints A-lifetimes Area: Lifetimes / regions 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.
#138408 opened Mar 12, 2025 by timokoesters
How can let y; and let y: _; be different to the borrow checker? A-borrow-checker Area: The borrow checker C-discussion Category: Discussion or questions that doesn't represent real issues. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138194 opened Mar 7, 2025 by steffahn
4
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
Confusing diagnostic when the error value converted by ? fails to satisfy a 'static bound A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints A-trait-system Area: Trait system D-confusing Diagnostics: Confusing error or lint that should be reworked. 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.
#136902 opened Feb 12, 2025 by Zalathar
@mejrs
2
"implementation is not general enough" even if only 'static is used. A-async-await Area: Async & Await A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136726 opened Feb 8, 2025 by tisonkun
Borrow checker does not release a mutable borrow when the condition is false on async function A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. fixed-by-polonius Compiling with `-Zpolonius` fixes this issue.
#136245 opened Jan 29, 2025 by ultimaweapon
ICE: cannot convert ... to a region vid A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#135427 opened Jan 13, 2025 by QuineDot
@oli-obk
3
improve spans for CallArgument constraints A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints C-enhancement Category: An issue proposing an enhancement or a PR with one. D-imprecise-spans Diagnostics: spans don't point to exactly the erroneous code T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#135238 opened Jan 8, 2025 by lcnr
strange borrowing suggestion A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#134805 opened Dec 26, 2024 by est31
Cannot return value from loop when temporary mutable access occurs before. A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. fixed-by-polonius Compiling with `-Zpolonius` fixes this issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#133539 opened Nov 27, 2024 by nikvoid
2
Large arrays of enum variants causes polonius to have massive performance issues A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. I-compiletime Issue: Problems and improvements with respect to compile times. NLL-polonius Issues related for using Polonius in the borrow checker requires-nightly This issue requires a nightly compiler in some way. 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.
#133054 opened Nov 14, 2024 by lilyyy411
2
GAT type Assoc<T: ?Sized> implicitly requires Self to be 'static A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints A-dyn-trait Area: trait objects, vtable layout A-lifetimes Area: Lifetimes / regions 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.
#131008 opened Sep 29, 2024 by Veetaha
4
"Reference to data owned by current function" for a function owning no data. A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints D-confusing Diagnostics: Confusing error or lint that should be reworked. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130584 opened Sep 19, 2024 by iago-lito
1
Moving mutable borrows in/out of inferred types results in the compiler thinking they are moved as if they were owned values A-borrow-checker Area: The borrow checker C-discussion Category: Discussion or questions that doesn't represent real issues.
#129694 opened Aug 28, 2024 by yorickpeterse
5
Allow exactly one mutable reference even after multiple immutable reference in same scope A-borrow-checker Area: The borrow checker C-discussion Category: Discussion or questions that doesn't represent real issues.
#128933 opened Aug 10, 2024 by coderboyisongithub
2
mut struct member var(ref) bind to new obj still hint: does not live long enough A-borrow-checker Area: The borrow checker T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#128225 opened Jul 26, 2024 by sosotan
6
*x == *y for trait objects produce move error, so it is not equivalent to PartialEq::eq(&*x, &*y) even though the reference says it is A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools A-dyn-trait Area: trait objects, vtable layout C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#127215 opened Jul 1, 2024 by estebank
5
Regression between nightlies with -Zpolonius A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. NLL-polonius Issues related for using Polonius in the borrow checker requires-nightly This issue requires a nightly compiler in some way. 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.
#126520 opened Jun 15, 2024 by Nadrieril
@amandasystems
7
MIR_borrow_checking and MIR_effect_checking are very slow A-borrow-checker Area: The borrow checker A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example 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.
#126440 opened Jun 13, 2024 by programmerjake
4
Implementing Copy can be a breaking change A-borrow-checker Area: The borrow checker A-lifetimes Area: Lifetimes / regions A-trait-system Area: Trait system C-bug Category: This is a bug. T-types Relevant to the types team, which will review and decide on the PR/issue.
#126179 opened Jun 9, 2024 by Jules-Bertholet
11
Generic (&A -> T) -> (&'a A -> Box<dyn Any + 'a>) crashes A-borrow-checker Area: The borrow checker C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ 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.
#125891 opened Jun 2, 2024 by ItzShiney
3
fixed-by-polonius loops/functions have very bad diagnostics A-borrow-checker Area: The borrow checker A-diagnostics Area: Messages for errors, warnings, and lints D-confusing Diagnostics: Confusing error or lint that should be reworked. D-terse Diagnostics: An error or lint that doesn't give enough information about the problem at hand. fixed-by-polonius Compiling with `-Zpolonius` fixes this issue. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125217 opened May 17, 2024 by jyn514
1
ProTip! Updated in the last three days: updated:>2025-05-27.