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Should <code>const FnMut</code> require <code>const FnOnce</code>?

A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

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

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

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.

#148251 In rust-lang/rust;

· theemathas opened on Oct 29, 2025

min_specialization with const traits can call non-const function in consteval

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

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

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

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-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.

#148200 In rust-lang/rust;

· theemathas opened on Oct 28, 2025

cannot specialize const trait impl with non-const

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

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

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

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.

#147130 In rust-lang/rust;

· Hezuikn-2 opened on Sep 28, 2025

Parsing issues around qualifiers and modifiers

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.

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

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

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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.

#146122 In rust-lang/rust;

· fmease opened on Sep 2, 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

Clean up remnants of #110395

A-testsuiteArea: The testsuite used to check the correctness of rustcArea: The testsuite used to check the correctness of rustc

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

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

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.

Status: Open.

#143871 In rust-lang/rust;

· fee1-dead opened on Jul 13, 2025

Tracking Issue for const_index

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)]`

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

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.

#143775 In rust-lang/rust;

· oli-obk opened on Jul 11, 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

<code>impl DefId ... was matchable</code> in <code>traits/select/mod.rs</code>

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

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

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

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

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.

#123443 In rust-lang/rust;

· Naserume opened on Apr 4, 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