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Tracking Issue for <code>PinCoerceUnsized</code>

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

A-DSTsArea: Dynamically-sized types (DSTs)Area: Dynamically-sized types (DSTs)

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-coerce_unsizedThe `CoerceUnsized` traitThe `CoerceUnsized` trait

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.

#150112 In rust-lang/rust;

· Darksonn opened on Dec 17, 2025

Specializing <code>Option&lt;T&gt;</code> for <code>bool</code> with associated types is not expressible (even on nightly)

A-specializationArea: Trait impl specializationArea: Trait impl specialization

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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.

#150087 In rust-lang/rust;

· ImadRedwan opened on Dec 17, 2025

Array patterns and tuple patterns don't properly check for Sized

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

A-type-systemArea: Type systemArea: Type system

C-bugCategory: This is a bug.Category: This is a bug.

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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.

#150040 In rust-lang/rust;

· theemathas opened on Dec 16, 2025

Skip PhantomData in Unsize checks

needs-fcpThis change is insta-stable, or significant enough to need a team FCP to proceed.This change is insta-stable, or significant enough to need a team FCP to proceed.

S-waiting-on-authorStatus: This is awaiting some action (such as code changes or more information) from the author.Status: This is awaiting some action (such as code changes or more information) from the author.

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 (in progress).

rust-lang/rustnumber 149968

#149968 In rust-lang/rust;

· dingxiangfei2009 opened on Dec 14, 2025

add note when there's a type mismatch due to param_env shadowing

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

A-trait-systemArea: Trait systemArea: Trait system

D-terseDiagnostics: An error or lint that doesn't give enough information about the problem at hand.Diagnostics: An error or lint that doesn't give enough information about the problem at hand.

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.

#149910 In rust-lang/rust;

· lcnr opened on Dec 12, 2025

Circularly defined GAT is somehow allowed and ICEs Miri

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

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-miriArea: The miri toolArea: The miri tool

A-trait-systemArea: Trait systemArea: Trait system

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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.

#149898 In rust-lang/rust;

· theemathas opened on Dec 12, 2025

Passing &amp;dyn Trait from Rc&lt;dyn Trait&gt;

A-coercionsArea: implicit and explicit `expr as Type` coercionsArea: implicit and explicit `expr as Type` coercions

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

A-dyn-traitArea: trait objects, vtable layoutArea: trait objects, vtable layout

C-bugCategory: This is a bug.Category: This is a bug.

D-lack-of-suggestionDiagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic.Diagnostics: Adding a (structured) suggestion would increase the quality of the diagnostic.

D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.Diagnostics: Confusing error or lint; hard to understand for new users.

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

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.

#149857 In rust-lang/rust;

· rnikander opened on Dec 10, 2025

Tracking issue for release notes of #148477: don't normalize where-clauses when checking well-formedness

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

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.

#149854 In rust-lang/rust;

· rustbot opened on Dec 10, 2025

·  

1.94.0

Diagnostic doesn't clarify that error "cyclic type of infinite size" refers to type size / a failed occurs-check &amp; not to the size of the in-memory representation of its values

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

A-type-systemArea: Type systemArea: Type system

D-terseDiagnostics: An error or lint that doesn't give enough information about the problem at hand.Diagnostics: An error or lint that doesn't give enough information about the problem at hand.

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.

#149842 In rust-lang/rust;

· jacobsa opened on Dec 10, 2025

Type with StructuralPartialEq impl with unsatisfied lifetime bounds can be used as const pattern

A-borrow-checkerArea: The borrow checkerArea: The borrow checker

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

C-bugCategory: This is a bug.Category: This is a bug.

requires-nightlyThis issue requires a nightly compiler in some way. When possible, use a F-* label instead.This issue requires a nightly compiler in some way. When possible, use a F-* label instead.

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.

#149841 In rust-lang/rust;

· theemathas opened on Dec 10, 2025

Not using anon consts for uses of const parameters caused us to accept more code for free type aliases

C-bugCategory: This is a bug.Category: This is a bug.

I-types-nominatedNominated for discussion during a types team meeting.Nominated for discussion during a types team meeting.

P-highHigh priorityHigh priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

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.

#149774 In rust-lang/rust;

· BoxyUwU opened on Dec 8, 2025

TrivialClone is not derived for generic types (Performance regression)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-specializationArea: Trait impl specializationArea: Trait impl specialization

C-bugCategory: This is a bug.Category: This is a bug.

I-libs-nominatedNominated for discussion during a libs team meeting.Nominated for discussion during a libs team meeting.

I-prioritizeIssue: Indicates that prioritization has been requested for this issue.Issue: Indicates that prioritization has been requested for this issue.

needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.

regression-from-stable-to-betaPerformance or correctness regression from stable to beta.Performance or correctness regression from stable to beta.

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-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library 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.

#149752 In rust-lang/rust;

· theemathas opened on Dec 8, 2025