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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

No way to get mutable reference to Vec member without expressing uniqueness over the full Vec A-collections Area: `std::collections` C-feature-request Category: A feature request, i.e: not implemented / a PR. needs-acp This change is blocked on the author creating an ACP. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#134507 opened Dec 19, 2024 by orlp
4
HashMap reallocates even though capacity is not exceeded A-collections Area: `std::collections` A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#134459 opened Dec 18, 2024 by e00E
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
HashMap struct key with 'static lifetime screws with return lifetime using methods like .get() A-collections Area: `std::collections` A-lifetimes Area: Lifetimes / regions C-bug Category: This is a bug. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#124614 opened May 2, 2024 by jsdw
3
Explain behaviour and performance of BinaryHeap for equal-ordered elements A-collections Area: `std::collections` 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-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#121713 opened Feb 27, 2024 by BigWingBeat
std::collections::BTreeMap docs could be improved by answering "When should I choose this over a HashMap" A-collections Area: `std::collections` A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools T-libs Relevant to the library team, which will review and decide on the PR/issue.
#120997 opened Feb 13, 2024 by mstange
3
Vec::from_raw_parts docs do not correctly handle empty buffers A-collections Area: `std::collections` A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools T-libs Relevant to the library team, which will review and decide on the PR/issue.
#119304 opened Dec 25, 2023 by oskgo
1
@lolbinarycat
2
RawVec sets capacity incorrectly, causing potentially many bugs A-allocators Area: Custom and system allocators A-collections Area: `std::collections` A-slice Area: `[T]` T-libs Relevant to the library team, which will review and decide on the PR/issue.
#116580 opened Oct 9, 2023 by jmaargh
3
VecDeque missing time complexity docs A-collections Area: `std::collections` A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-feature-request Category: A feature request, i.e: not implemented / a PR. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#100182 opened Aug 5, 2022 by ArtifyCZ
@AnthonyZhOon
8
Type inference on HashSet A-collections Area: `std::collections` A-diagnostics Area: Messages for errors, warnings, and lints A-inference Area: Type inference T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#94969 opened Mar 15, 2022 by Yuri6037
1
Vec::pop() sometimes returns value inefficiently. A-collections Area: `std::collections` C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#85365 opened May 16, 2021 by human-0
6
Vec::splice() has noticeable overhead for some use cases A-collections Area: `std::collections` C-enhancement Category: An issue proposing an enhancement or a PR with one. I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#83266 opened Mar 18, 2021 by adrian17
4
Tracking Issue for map_try_insert A-collections Area: `std::collections` C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#82766 opened Mar 4, 2021 by m-ou-se
1 of 3 tasks
41
Large BTreeMap key or value types cause avoidable stack overflow A-collections Area: `std::collections` C-enhancement Category: An issue proposing an enhancement or a PR with one. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#81444 opened Jan 27, 2021 by ssomers
8
Lifetime of input (key) to HashMap::get() gets entanged w/ that of its output (value) A-collections Area: `std::collections` A-lifetimes Area: Lifetimes / regions C-bug Category: This is a bug. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#80389 opened Dec 26, 2020 by zeenix
6
HashMap reports zero capacity without freeing memory A-collections Area: `std::collections` C-bug Category: This is a bug. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#79178 opened Nov 18, 2020 by Diggsey
1
6
Possible Vec::truncate improvement A-collections Area: `std::collections` E-hard Call for participation: Hard difficulty. Experience needed to fix: A lot. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#76089 opened Aug 29, 2020 by leonardo-m
5
Better codegen for FromIterator Box<[T]> A-collections Area: `std::collections` A-iterators Area: Iterators C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such 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. I-heavy Issue: Problems and improvements with respect to binary size of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#75636 opened Aug 17, 2020 by pickfire
1
@GoldsteinE
3
SpecForElem for i16/u16 and other digits A-collections Area: `std::collections` A-specialization Area: Trait impl specialization C-enhancement Category: An issue proposing an enhancement or a PR with one. I-slow Issue: Problems and improvements with respect to performance of generated code. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#73995 opened Jul 3, 2020 by pickfire
3
HashSet and BTreeSet difference() method argument lifetime overconstrained A-collections Area: `std::collections` C-bug Category: This is a bug. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#73788 opened Jun 27, 2020 by BartMassey
7
Tracking Issue for Extend::{extend_one,extend_reserve} A-collections Area: `std::collections` A-iterators Area: Iterators 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 Libs-Tracked Libs issues that are tracked on the team's project board. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#72631 opened May 26, 2020 by cuviper
2 of 3 tasks
22
Tracking Issue for const_btree_len A-collections Area: `std::collections` A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. finished-final-comment-period The final comment period is finished for this PR / Issue. Libs-Tracked Libs issues that are tracked on the team's project board. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#71835 opened May 3, 2020 by LG3696
1 of 2 tasks
18
Collect to slice A-collections Area: `std::collections` A-iterators Area: Iterators C-feature-request Category: A feature request, i.e: not implemented / a PR. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#71387 opened Apr 21, 2020 by leonardo-m
3
Vec::reserve should use alloc_excess A-allocators Area: Custom and system allocators A-collections Area: `std::collections` C-enhancement Category: An issue proposing an enhancement or a PR with one. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#71383 opened Apr 21, 2020 by hsivonen
7
Tracking Issue for {BTreeMap,BTreeSet}::extract_if A-collections Area: `std::collections` 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 Libs-Tracked Libs issues that are tracked on the team's project board. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#70530 opened Mar 29, 2020 by ssomers
3 of 5 tasks
27
ProTip! no:milestone will show everything without a milestone.