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

sys::thread_local::key::tests::destructors fails under x86 Windows 7 A-atomic Area: Atomics, barriers, and sync primitives A-destructors Area: Destructors (`Drop`, …) A-testsuite Area: The testsuite used to check the correctness of rustc A-thread-locals Area: Thread local storage (TLS) C-bug Category: This is a bug. O-windows-7 OS: Windows 7 or Windows Server 2008 R2 or etc. O-windows-msvc Toolchain: MSVC, Operating system: Windows O-x86_32 Target: x86 processors, 32 bit (like i686-*) (IA-32) P-low Low priority regression-from-stable-to-beta Performance or correctness regression from stable to beta. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#141300 opened May 20, 2025 by PaulDance
6
Better errors for polymorphic recursion A-destructors Area: Destructors (`Drop`, …) A-diagnostics Area: Messages for errors, warnings, and lints D-confusing Diagnostics: Confusing error or lint that should be reworked. D-verbose Diagnostics: Too much output caused by a single piece of incorrect code. I-monomorphization Issue: An error at monomorphization time. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136528 opened Feb 4, 2025 by jake-87
5
HashMap: panic in element destructor causes leaks of unrelated elements A-collections Area: `std::collections` A-destructors Area: Destructors (`Drop`, …) C-discussion Category: Discussion or questions that doesn't represent real issues. I-memleak Issue: Runtime memory leak without `mem::forget`. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#132222 opened Oct 27, 2024 by lukas-code
3
ICE: Building async destructor constructor shim is not yet implemented for type: Coroutine -Zvalidate-mir Unstable option: MIR validation A-async-await Area: Async & Await A-coroutines Area: Coroutines A-destructors Area: Destructors (`Drop`, …) 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. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132103 opened Oct 24, 2024 by matthiaskrgr
1
Implicit returns and missing semicolons after return might cause a different drop order A-destructors Area: Destructors (`Drop`, …) 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.
#131313 opened Oct 6, 2024 by porky11
6
rustdoc: hang/OOM with recursive type A-destructors Area: Destructors (`Drop`, …) C-bug Category: This is a bug. fixed-by-next-solver Fixed by the next-generation trait solver, `-Znext-solver`. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#102910 opened Oct 11, 2022 by matthiaskrgr
3
unhelpful drop check cycle encountered errors on infinite-sized recursive enum with a boxed variant A-destructors Area: Destructors (`Drop`, …) A-diagnostics Area: Messages for errors, warnings, and lints C-bug Category: This is a bug. I-cycle Issue: A query cycle occurred while none was expected T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#99061 opened Jul 8, 2022 by pro465
2
lint against unexpectedly late drop for temporaries in match scrutinee expressions A-destructors Area: Destructors (`Drop`, …) A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. C-feature-request Category: A feature request, i.e: not implemented / a PR. E-help-wanted Call for participation: Help is requested to fix this issue. E-medium Call for participation: Medium difficulty. Experience needed to fix: Intermediate. E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#93883 opened Feb 10, 2022 by yaahc
@PrestonFrom
38
Excessive drop glue duplication in vtables can blow up compile times A-codegen Area: Code generation A-destructors Area: Destructors (`Drop`, …) C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-compiletime Issue: Problems and improvements with respect to compile times. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#88438 opened Aug 28, 2021 by jonas-schievink
3
E0493 emitted without drop when destructuring A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-destructors Area: Destructors (`Drop`, …) 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.
#86897 opened Jul 5, 2021 by CAD97
3
Error with static lifetime inference in consts when using types with drop implementation A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-destructors Area: Destructors (`Drop`, …) A-lifetimes Area: Lifetimes / regions C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#86672 opened Jun 27, 2021 by oberien
1
Erroneous drop_bounds lint A-destructors Area: Destructors (`Drop`, …) A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#86653 opened Jun 26, 2021 by jonhoo
3
Warn when using [foo; 0] where foo is a non-const expression that evaluates to a Drop type A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-destructors Area: Destructors (`Drop`, …) A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. A-zst Area: Zero-sized types (ZSTs). T-lang Relevant to the language team, which will review and decide on the PR/issue.
#79580 opened Nov 30, 2020 by bstrie
5
inaccurate const drop error doesn't mention #![feature(const_precise_live_drops)] A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-destructors Area: Destructors (`Drop`, …) A-diagnostics Area: Messages for errors, warnings, and lints C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#79166 opened Nov 18, 2020 by meithecatte
3
'Dropping temporaries' prevents borrow check to succeed in match arm without shared ownership A-destructors Area: Destructors (`Drop`, …) A-lifetimes Area: Lifetimes / regions A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix` C-bug Category: This is a bug. 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.
#76149 opened Aug 31, 2020 by Byron
9
Tracking issue for #![feature(const_precise_live_drops)] A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-destructors Area: Destructors (`Drop`, …) B-unstable Blocker: Implemented in the nightly compiler and unstable. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC S-tracking-needs-summary Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation. 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.
#73255 opened Jun 11, 2020 by ecstatic-morse
1 task done
@nikomatsakis
52
Drop with guaranteed move elision A-destructors Area: Destructors (`Drop`, …) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-enhancement Category: An issue proposing an enhancement or a PR with one. 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.
#62508 opened Jul 8, 2019 by tmandry
1
4
Unclear unsoundness warning when reborrowing data using late-bound lifetimes across multiple trait definitions A-borrow-checker Area: The borrow checker A-destructors Area: Destructors (`Drop`, …) 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.
#58868 opened Mar 2, 2019 by darkwisebear
5
"--emit mir" does not emit drop shim A-destructors Area: Destructors (`Drop`, …) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#58102 opened Feb 3, 2019 by RalfJung
Recursive Drop causes stack overflow even for object trees A-destructors Area: Destructors (`Drop`, …) A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-enhancement Category: An issue proposing an enhancement or a PR with one. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#58068 opened Feb 2, 2019 by slaymaker1907
9
Can't implement Drop on a type with a higher ranked lifetime as a trait bound. A-destructors Area: Destructors (`Drop`, …) A-higher-ranked Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs) A-trait-system Area: Trait system C-enhancement Category: An issue proposing an enhancement or a PR with one. 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.
#51386 opened Jun 6, 2018 by pythonesque
1
rustdoc: transitive Drop indicators should be shown A-destructors Area: Destructors (`Drop`, …) A-synthetic-impls Area: Synthetic impls, used by rustdoc to document auto traits and traits with blanket impls C-feature-request Category: A feature request, i.e: not implemented / a PR. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#49689 opened Apr 5, 2018 by ishitatsuyuki
Panics in destructors can cause the return value to be leaked A-destructors Area: Destructors (`Drop`, …) C-enhancement Category: An issue proposing an enhancement or a PR with one. I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness P-high High priority 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.
#47949 opened Feb 1, 2018 by arielb1
5
@matthewjasper
30
rustc generates a lot of llvm ir for small programs due to inline generated drops A-codegen Area: Code generation A-destructors Area: Destructors (`Drop`, …) C-enhancement Category: An issue proposing an enhancement or a PR with one. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-compiletime Issue: Problems and improvements with respect to compile times. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#38827 opened Jan 4, 2017 by jrmuizel
14
Using pattern match directly on LockResult causes deadlock A-destructors Area: Destructors (`Drop`, …) A-lifetimes Area: Lifetimes / regions C-bug Category: This is a bug. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#37612 opened Nov 6, 2016 by lloydmeta
20
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