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Tracking issue for RFC 3637: Guard patterns

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-guard_patterns`#![feature(guard_patterns)]``#![feature(guard_patterns)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

Tracking Issue

#129967 In rust-lang/rust;

· traviscross opened on Sep 4, 2024

2 comments

Tracking implementation for MC/DC

0 / 20% completed

A-code-coverageArea: Source-based code coverage (-Cinstrument-coverage)Area: Source-based code coverage (-Cinstrument-coverage)

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#124144 In rust-lang/rust;

· ZhuUx opened on Apr 19, 2024

32 comments

Tracking Issue for RFC 3550: New range types

A-maybe-future-editionSomething we may consider for a future edition.Something we may consider for a future edition.

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-new_range`#![feature(new_range)]``#![feature(new_range)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-documentationStatus: Needs documentation.Status: Needs documentation.

S-tracking-needs-migration-lintStatus: This item needs a migration lint.Status: This item needs a migration lint.

S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#123741 In rust-lang/rust;

· traviscross opened on Apr 10, 2024

13 comments



Tracking issue for RFC 3621: derive(CoercePointee)

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-derive_coerce_pointeeFeature: RFC 3621's oft-renamed implementationFeature: RFC 3621's oft-renamed implementation

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#123430 In rust-lang/rust;

· traviscross opened on Apr 3, 2024

2 comments

Tracking Issue for postfix match

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-postfix_match`#![feature(postfix_match)]``#![feature(postfix_match)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#121618 In rust-lang/rust;

· RossSmyth opened on Feb 26, 2024

1 comment

Tracking Issue for function delegation (fn_delegation, RFC 3530)

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-fn_delegation`#![feature(fn_delegation)]``#![feature(fn_delegation)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#118212 In rust-lang/rust;

· petrochenkov opened on Nov 23, 2023

6 comments

Tracking Issue for Never Patterns (never_patterns)

A-exhaustiveness-checkingRelating to exhaustiveness / usefulness checking of patternsRelating to exhaustiveness / usefulness checking of patterns

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-never_patterns`#![feature(never_patterns)]``#![feature(never_patterns)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#118155 In rust-lang/rust;

· Nadrieril opened on Nov 22, 2023

42 comments

Tracking issue for lazy type aliases

A-maybe-future-editionSomething we may consider for a future edition.Something we may consider for a future edition.

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-lazy_type_alias`#![feature(lazy_type_alias)]``#![feature(lazy_type_alias)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-migration-lintStatus: This item needs a migration lint.Status: This item needs a migration lint.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#112792 In rust-lang/rust;

· GuillaumeGomez opened on Jun 19, 2023

5 comments



Tracking Issue for return type notation

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-return_type_notation`#[feature(return_type_notation)]``#[feature(return_type_notation)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#109417 In rust-lang/rust;

· compiler-errors opened on Mar 20, 2023

10 comments

Tracking Issue for non-lifetime binders

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-non_lifetime_binders`#![feature(non_lifetime_binders)]``#![feature(non_lifetime_binders)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#108185 In rust-lang/rust;

· compiler-errors opened on Feb 17, 2023

10 comments

Tracking issue for -Z randomize-layout

-Zrandomize-layoutUnstable option: Randomize the layout of types.Unstable option: Randomize the layout of types.

A-CLIArea: Command-line interface (CLI) to the compilerArea: Command-line interface (CLI) to the compiler

A-layoutArea: Memory layout of typesArea: Memory layout of types

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-documentationStatus: Needs documentation.Status: Needs documentation.

S-tracking-needs-summaryStatus: It's hard to tell what's been done and what hasn't! Someone should do some investigation.Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#106764 In rust-lang/rust;

· dtolnay opened on Jan 12, 2023

1 comment

Diagnostic Translation

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-translationArea: Translation infrastructure, and migrating existing diagnostics to SessionDiagnosticArea: Translation infrastructure, and migrating existing diagnostics to SessionDiagnostic

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-design-concernsStatus: There are blocking design concerns.Status: There are blocking design concerns.

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-deep-researchStatus: This feature needs deep research to solve design or implementation issues.Status: This feature needs deep research to solve design or implementation issues.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#100717 In rust-lang/rust;

· davidtwco opened on Aug 18, 2022

110 comments

Tracking Issue for Interoperability With C++ Destruction Order

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#100344 In rust-lang/rust;

· pnkfelix opened on Aug 9, 2022

2 comments



Tracking Issue for Deprecate target_vendor

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#100343 In rust-lang/rust;

· pnkfelix opened on Aug 9, 2022

7 comments

Tracking Issue for impl Trait as output type of Fn traits in function return position

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-impl_trait_in_fn_trait_return`#![feature(impl_trait_in_fn_trait_return)]``#![feature(impl_trait_in_fn_trait_return)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#99697 In rust-lang/rust;

· WaffleLapkin opened on Jul 24, 2022

Tracking Issue for native link modifier as-needed

A-linkageArea: linking into static, shared libraries and binariesArea: linking into static, shared libraries and binaries

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-native_link_modifiers_as_needed`#![feature(native_link_modifiers_as_needed)]``#![feature(native_link_modifiers_as_needed)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

S-tracking-needs-to-bakeStatus: The implementation is "complete" but it needs time to bake.Status: The implementation is "complete" but it needs time to bake.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#99424 In rust-lang/rust;

· petrochenkov opened on Jul 18, 2022

8 comments

Tracking Issue for feature(coroutine_clone)

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-coroutine_clone`#![feature(coroutine_clone)]``#![feature(coroutine_clone)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#95360 In rust-lang/rust;

· canndrew opened on Mar 27, 2022

Tracking Issue for #[deprecated_safe] attribute

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-deprecated_safe`#![feature(deprecated_safe)]``#![feature(deprecated_safe)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#94978 In rust-lang/rust;

· ghost opened on Mar 15, 2022

2 comments

Tracking Issue for warning on unused lifetimes (by default)

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#94038 In rust-lang/rust;

· Mark-Simulacrum opened on Feb 16, 2022

Tracking issue for associated const equality

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

B-experimentalBlocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).Blocker: In-tree experiment; RFC pending, not yet approved or unneeded (requires FCP to stabilize).

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-associated_const_equality`#![feature(associated_const_equality)]``#![feature(associated_const_equality)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#92827 In rust-lang/rust;

· JulianKnodt opened on Jan 12, 2022

12 comments



Tracking Issue for enabling elided_lifetimes_in_paths lints

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

E-help-wantedCall for participation: Help is requested to fix this issue.Call for participation: Help is requested to fix this issue.

L-elided_lifetimes_in_pathsLint: elided_lifetimes_in_pathsLint: elided_lifetimes_in_paths

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

Tracking Issue

#91639 In rust-lang/rust;

· scottmcm opened on Dec 7, 2021

55 comments

Tracking Issue for RFC: Supertrait Item Shadowing

B-RFC-implementedBlocker: Approved by a merged RFC and implemented but not stabilized.Blocker: Approved by a merged RFC and implemented but not stabilized.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-supertrait_item_shadowing`#![feature(supertrait_item_shadowing)]``#![feature(supertrait_item_shadowing)]`

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

T-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#89151 In rust-lang/rust;

· pnkfelix opened on Sep 21, 2021

14 comments

Tracking Issue for NOOP_METHOD_CALL lint

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#83099 In rust-lang/rust;

· Aaron1011 opened on Mar 13, 2021

2 comments

Tracking issue for normalizing (evaluating) types in rustdoc-generated docs (-Z normalize-docs)

-Znormalize-docsUnstable rustdoc option: Normalize/evaluate types when generating docsUnstable rustdoc option: Normalize/evaluate types when generating docs

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

S-tracking-design-concernsStatus: There are blocking design concerns.Status: There are blocking design concerns.

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

Status: Open.

#82692 In rust-lang/rust;

· jyn514 opened on Mar 2, 2021

4 comments

Tracking Issue for const_heap

A-allocatorsArea: Custom and system allocatorsArea: Custom and system allocators

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-const_heap`#[feature(const_heap)]``#[feature(const_heap)]`

Libs-TrackedLibs issues that are tracked on the team's project board.Libs issues that are tracked on the team's project board.

needs-rfcThis change is large or controversial enough that it should have an RFC accepted before doing it.This change is large or controversial enough that it should have an RFC accepted before doing it.

S-tracking-impl-incompleteStatus: The implementation is incomplete.Status: The implementation is incomplete.

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#79597 In rust-lang/rust;

· oli-obk opened on Dec 1, 2020

15 comments