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Tracking Issue for <code>peekable_next_if_map</code>

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-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.

Tracking Issue

#143702 In rust-lang/rust;

· kennytm opened on Jul 9, 2025

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

Tracking implementation for MC/DC

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

F-coverage-mcdcMC/DC coverage via -Cinstrument-coverage with -Zcoverage-options=mcdcMC/DC coverage via -Cinstrument-coverage with -Zcoverage-options=mcdc

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

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

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

Tracking Issue for function delegation (<code>fn_delegation</code>, 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

Tracking Issue for Never Patterns (<code>never_patterns</code>)

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

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

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

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

Tracking issue for <code>-Z randomize-layout</code>

-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

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