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<code>const trait Trait {}</code> syntax is accepted without a feature gate on 1.90 beta and master

A-parserArea: The lexing & parsing of Rust source code to an ASTArea: The lexing & parsing of Rust source code to an AST

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

P-highHigh priorityHigh priority

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

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.

#144958 In rust-lang/rust;

· fmease opened on Aug 5, 2025

Gate const trait syntax

beta-nominatedNominated for backporting to the compiler in the beta channel.Nominated for backporting to the compiler in the beta channel.

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

S-waiting-on-borsStatus: Waiting on bors to run and complete tests. Bors will change the label on completion.Status: Waiting on bors to run and complete tests. Bors will change the label on completion.

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 (in progress).

rust-lang/rustnumber 144956

#144956 In rust-lang/rust;

· fmease opened on Aug 5, 2025

fix: Reject async assoc fns of <code>#[const_trait]</code> in ast_passes

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

S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.Status: Awaiting review from the assignee but also interested parties.

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 (in progress).

rust-lang/rustnumber 144907

#144907 In rust-lang/rust;

· ShoyuVanilla opened on Aug 4, 2025

Infer the <code>[const] Destruct</code> bound on fields from <code>[const] Destruct</code> bound on struct

A-trait-systemArea: Trait systemArea: Trait system

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

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

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

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.

#144207 In rust-lang/rust;

· Randl opened on Jul 20, 2025

Tracking Issue for RFC 3762, "Make trait methods callable in const contexts"

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

A-trait-systemArea: Trait systemArea: Trait system

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_trait_impl`#![feature(const_trait_impl)]``#![feature(const_trait_impl)]`

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

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-langRelevant to the language teamRelevant to the language team

WG-const-evalWorking group: Const evaluationWorking group: Const evaluation

Status: Open.

#143874 In rust-lang/rust;

· fee1-dead opened on Jul 13, 2025

Tracking Issue for <code>const_destruct</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

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

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

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.

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

Terse diagnostic on lack of ~const bound in inherent associated const functions

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

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.

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

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

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.

#126975 In rust-lang/rust;

· alestane opened on Jun 26, 2024

Provide a way for derives to know if they were invoked with <code>#[derive_const]</code>

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

A-trait-systemArea: Trait systemArea: Trait system

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

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

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

S-blockedStatus: Blocked on something else such as an RFC or other implementation work.Status: Blocked on something else such as an RFC or other implementation work.

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-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.

WG-macrosWorking group: MacrosWorking group: Macros

Status: Open.

#118304 In rust-lang/rust;

· jhpratt opened on Nov 26, 2023