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step_by() on new ranges is less optimized than the old ranges.

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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.

#157754 In rust-lang/rust;

· theemathas opened on Jun 11, 2026

[ICE]: rustdoc: Deref impl without Target type

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

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

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

Status: Open.

#156484 In rust-lang/rust;

· matthiaskrgr opened on May 12, 2026

ICE in improper_ctypes lint with specialization and associated type projection in extern static

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

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

L-improper_ctypesLint: improper_ctypesLint: improper_ctypes

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-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.

#152405 In rust-lang/rust;

· trait-Cong opened on Feb 9, 2026

Specializing Option<T> for bool 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;

· minab168 opened on Dec 17, 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.

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-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

·  

1.93.0

min_specialization is unsound due to trivially-false lifetime bound

A-impossible-boundsArea: Issues related to have impossible trait bounds in scope (impossible predicates)Area: Issues related to have impossible trait bounds in scope (impossible predicates)

A-specializationArea: Trait impl specializationArea: Trait impl specialization

A-trait-systemArea: Trait systemArea: Trait system

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

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

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

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.

#149257 In rust-lang/rust;

· theemathas opened on Nov 24, 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)]`

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

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

ICE from inductive cycle in specialization

A-coinductionArea: Concerning coinduction, most often for auto traitsArea: Concerning coinduction, most often for auto traits

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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) ❄️

P-mediumMedium priorityMedium 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.

#147507 In rust-lang/rust;

· theemathas opened on Oct 9, 2025

The Zip iterator does not update the underlying iterator correctly in its TrustedLen 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

Incorrect expected type for associated type with specialization

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.

Status: Open.

#132804 In rust-lang/rust;

· justinlovinger opened on Nov 9, 2024

Confusing error message when using min_specialization with dyn Trait

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

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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-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.

#130102 In rust-lang/rust;

· oskgo opened on Sep 8, 2024

Compiler hang with recursive trait requirement and default impl

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

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.

#117909 In rust-lang/rust;

· jruderman opened on Nov 14, 2023