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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

<code>#[non_exhaustive]</code> affects whether code has UB or not, according to Miri

A-exhaustiveness-checkingRelating to exhaustiveness / usefulness checking of patternsRelating to exhaustiveness / usefulness checking of patterns

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

A-miriArea: The miri toolArea: The miri tool

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

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

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

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#147722 In rust-lang/rust;

· theemathas opened on Oct 15, 2025

<code>format_args</code> deduplicates consts with interior mutability or destructor

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

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

A-fmtArea: `core::fmt`Area: `core::fmt`

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

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

Status: Open.

#145739 In rust-lang/rust;

· theemathas opened on Aug 22, 2025

Match guard can both move and static-promote a single constant

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

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

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

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

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

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

P-lang-drag-3Lang team prioritization drag level 3.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.Lang team prioritization drag level 3.https://rust-lang.zulipchat.com/#narrow/channel/410516-t-lang.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#145237 In rust-lang/rust;

· theemathas opened on Aug 11, 2025

<code>&amp;raw const</code> gets static-promoted in match guard

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

A-constant-promotionArea: constant promotionArea: constant promotion

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

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

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#144939 In rust-lang/rust;

· theemathas opened on Aug 5, 2025

<code>#[inline]</code> affects whether consteval happens

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

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

Status: Open.

#144460 In rust-lang/rust;

· theemathas opened on Jul 25, 2025

The <code>Zip</code> iterator does not update the underlying iterator correctly in its <code>TrustedLen</code> specialization.

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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.

#144012 In rust-lang/rust;

· theemathas opened on Jul 16, 2025

<code>super let</code> is allowed in nonsensical positions

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

F-super_letit's super, let's go!it's super, let's go!

I-lang-radarItems that are on lang's radar and will need eventual work or consideration.Items that are on lang's radar and will need eventual work or consideration.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#142281 In rust-lang/rust;

· theemathas opened on Jun 10, 2025

Transmuting fn pointer to a usize in const somehow causes UB?

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

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

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

#142230 In rust-lang/rust;

· theemathas opened on Jun 9, 2025

Can't cast a pointer of a trait object newtype to a pointer of that trait object.

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

A-raw-pointersArea: raw pointers, MaybeUninit, NonNullArea: raw pointers, MaybeUninit, NonNull

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

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.

#128625 In rust-lang/rust;

· theemathas opened on Aug 4, 2024