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Draft release notes for 1.86.0
#138795 opened Mar 21, 2025 by cuviper
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Issues list

&& operator chains (and ||, possibly) generates unoptimizable LLVM IR A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. 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-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.
#83623 opened Mar 28, 2021 by AngelicosPhosphoros
21 🚀 79
Tracking issue for specialization (RFC 1210) A-specialization Area: Trait impl specialization A-trait-system Area: Trait system B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. B-RFC-implemented Blocker: Approved by a merged RFC and implemented but not stabilized. 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 F-specialization `#![feature(specialization)]` I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness requires-nightly This issue requires a nightly compiler in some way. S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#31844 opened Feb 23, 2016 by nikomatsakis
1 of 8 tasks
323 🚀 62
Tracking issue for eRFC 2497, "if- and while-let-chains, take 2" 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 F-let_chains `#![feature(let_chains)]` S-tracking-ready-to-stabilize Status: This is ready to stabilize; it may need a stabilization report and a PR T-lang Relevant to the language team, which will review and decide on the PR/issue.
#53667 opened Aug 24, 2018 by Centril
9 of 15 tasks
2
71 🚀 62
Tracking Issue for RFC 2948: Portable SIMD A-SIMD Area: SIMD (Single Instruction Multiple Data) A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC needs-rfc This change is large or controversial enough that it should have an RFC accepted before doing it. PG-portable-simd Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd) T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#86656 opened Jun 27, 2021 by calebzulawski
1 of 9 tasks
37 🚀 56
Tracking Issue for inline const patterns (RFC 2920) A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) 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 F-inline_const_pat #![feature(inline_const_pat)] F-inline_const Inline constants (aka: const blocks, const expressions, anonymous constants) 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.
#76001 opened Aug 27, 2020 by nikomatsakis
9 of 11 tasks
89 🚀 47
Tracking issue for ? operator and try blocks (RFC 243, question_mark & try_blocks features) A-error-handling Area: Error handling B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. B-RFC-implemented Blocker: Approved by a merged RFC and implemented but not stabilized. 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 F-try_blocks `#![feature(try_blocks)]` Libs-Tracked Libs issues that are tracked on the team's project board. S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language 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.
#31436 opened Feb 5, 2016 by nikomatsakis
10 of 12 tasks
450 🚀 46
Tracking issue for RFC 2033: Experimentally add coroutines to Rust A-coroutines Area: Coroutines B-experimental Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize). 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 F-coroutines `#![feature(coroutines)]` S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#43122 opened Jul 8, 2017 by aturon
161 🚀 39
Tracking Issue for complex generic constants: feature(generic_const_exprs) A-const-generics Area: const generics (parameters and arguments) C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC F-generic_const_exprs `#![feature(generic_const_exprs)]` S-tracking-impl-incomplete Status: The implementation is incomplete. 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.
#76560 opened Sep 10, 2020 by lcnr
67 🚀 31
Tracking issue: declarative macros 2.0 A-decl-macros-2-0 Area: Declarative macros 2.0 (#39412) A-hygiene Area: Macro hygiene A-macros Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..) B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. 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 F-decl_macro `#![feature(decl_macro)]` S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language team, which will review and decide on the PR/issue. WG-macros Working group: Macros
#39412 opened Jan 30, 2017 by nrc
11 of 19 tasks
80 🚀 29
Use const generics for array Default impl A-array Area: `[T; N]` A-const-generics Area: const generics (parameters and arguments) A-slice Area: `[T]` Libs-Tracked Libs issues that are tracked on the team's project board. 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. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#61415 opened May 31, 2019 by varkor
1 of 3 tasks
19 🚀 28
Tracking issue for RFC 3681: Default field values B-RFC-implemented Blocker: Approved by a merged RFC and implemented but not stabilized. 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 F-default_field_values `#![feature(default_field_values)]` 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.
#132162 opened Oct 25, 2024 by estebank
9 of 17 tasks
13 🚀 28
Tracking Issue for experimental yeet expressions (feature(yeet_expr)) 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.
#96373 opened Apr 25, 2022 by scottmcm
6 tasks
25 🚀 23
Tracking Issue for "unsafe blocks in unsafe fn" (RFC #2585) 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 disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. F-unsafe-block-in-unsafe-fn RFC #2585 finished-final-comment-period The final comment period is finished for this PR / Issue. S-tracking-impl-incomplete Status: The implementation is incomplete. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#71668 opened Apr 29, 2020 by nikomatsakis
3 of 5 tasks
105 🚀 21
Tracking issue for trait aliases A-trait-system Area: Trait system B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. 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 F-trait_alias `#![feature(trait_alias)]` S-tracking-needs-summary Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#41517 opened Apr 24, 2017 by withoutboats
5 of 13 tasks
118 🚀 20
Adding an unreachable branch helps optimize the code when matching on x % N A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. 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 E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. 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.
#93514 opened Jan 31, 2022 by WaffleLapkin
1
12 🚀 18
Use lld by default on x64 msvc windows A-linkage Area: linking into static, shared libraries and binaries C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC metabug Issues about issues themselves ("bugs about bugs") S-tracking-needs-summary Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation.
#71520 opened Apr 24, 2020 by Gankra
6 tasks done
33 🚀 15
Tracking Issue for Iterator::try_collect 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.
#94047 opened Feb 16, 2022 by a-lafrance
1 of 6 tasks
31 🚀 14
Tracking Issue for #![feature(async_iterator)] A-async-await Area: Async & Await AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. 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-lang Relevant to the language 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. WG-async Working group: Async & await
#79024 opened Nov 13, 2020 by yoshuawuyts
3 of 9 tasks
31 🚀 14
Tracking Issue for ops::Yeet (feature(try_trait_v2_yeet)) 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.
#96374 opened Apr 25, 2022 by scottmcm
4 tasks
14 🚀 13
Tracking issue for RFC 2963: rustdoc JSON backend A-rustdoc-json Area: Rustdoc JSON backend 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 T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#76578 opened Sep 10, 2020 by Manishearth
3 of 5 tasks
21 🚀 12
Tracking issue for RFC 2532, "Associated type defaults" A-associated-items Area: Associated items (types, constants & functions) B-RFC-approved Blocker: Approved by a merged RFC but not yet implemented. 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 F-associated_type_defaults `#![feature(associated_type_defaults)]` S-tracking-needs-summary Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#29661 opened Nov 6, 2015 by aturon
41 of 85 tasks
41 🚀 12
Tracking issue: deref patterns A-patterns Relating to patterns and pattern matching C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC F-deref_patterns `#![feature(deref_patterns)]` needs-rfc This change is large or controversial enough that it should have an RFC accepted before doing it. S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#87121 opened Jul 14, 2021 by nrc
1 of 6 tasks
66 🚀 11
Tracking issue for Fn traits (unboxed_closures & fn_traits feature) B-RFC-implemented Blocker: Approved by a merged RFC and implemented but not stabilized. 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 F-unboxed_closures `#![feature(unboxed_closures)]` S-tracking-design-concerns Status: There are blocking design concerns. T-lang Relevant to the language 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.
#29625 opened Nov 5, 2015 by aturon
1 of 2 tasks
66 🚀 10
Tracking Issue for assert_matches 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. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#82775 opened Mar 4, 2021 by m-ou-se
5 of 7 tasks
3
95 🚀 10
Stabilize return type notation (RFC 3654) disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. I-lang-nominated Nominated for discussion during a lang team meeting. S-waiting-on-documentation Status: Waiting on approved PRs to documentation before merging S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#138424 opened Mar 12, 2025 by compiler-errors Loading…
1 of 4 tasks
26 🚀 10
ProTip! Follow long discussions with comments:>50.