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Tracking issue to remove <code>TyKind::CoroutineWitness</code> from the type system

A-coroutinesArea: Coroutines Area: Coroutines

C-cleanupCategory: PRs that clean code up or issues documenting cleanup. Category: PRs that clean code up or issues documenting cleanup.

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

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.

#143017 In rust-lang/rust;

· compiler-errors opened on Jun 25, 2025

Tracking Issue for <code>const_destruct</code>

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

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

PG-const-traitsProject group: Const traits Project group: Const traits

T-langRelevant to the language team Relevant 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.

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.

#133214 In rust-lang/rust;

· compiler-errors opened on Nov 19, 2024

Tracking Issue for <code>async_fn_in_dyn_trait</code>

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 RFC Category: An issue tracking the progress of sth. like the implementation of an RFC

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

T-langRelevant to the language team Relevant to the language team

Status: Open.

#133119 In rust-lang/rust;

· compiler-errors opened on Nov 16, 2024

Work tracking issue for moving <code>rustc_infer</code> error reporting into <code>rustc_trait_selection</code>

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

A-type-systemArea: Type system Area: Type system

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

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.

#127492 In rust-lang/rust;

· compiler-errors opened on Jul 8, 2024

Tracking issue for future-incompatibility lint <code>self_constructor_from_outer_item</code>

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-future-incompatibilityCategory: Future-incompatibility lints Category: Future-incompatibility lints

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

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.

#124186 In rust-lang/rust;

· compiler-errors opened on Apr 20, 2024

Tracking issue for future-incompatibility lint <code>elided_lifetimes_in_associated_constant</code>

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

A-lifetimesArea: Lifetimes / regions Area: Lifetimes / regions

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-future-incompatibilityCategory: Future-incompatibility lints Category: Future-incompatibility lints

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

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.

#115010 In rust-lang/rust;

· compiler-errors opened on Aug 19, 2023

·

1.74.0

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 RFC Category: 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 team Relevant 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 RFC Category: 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