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ICE from inductive cycle in specialization

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.

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 <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

Incorrect expected type for associated type with <code>specialization</code>

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

Array and Vec's Clone specialization is maybe unsound with conditionally Copy types.

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

E-needs-investigationCall for partcipation: This issues needs some investigation to determine current statusCall for partcipation: This issues needs some investigation to determine current status

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.

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

P-mediumMedium priorityMedium priority

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.

#132442 In rust-lang/rust;

· theemathas opened on Nov 1, 2024

Confusing error message when using <code>min_specialization</code> with <code>dyn Trait</code>

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.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.

#130102 In rust-lang/rust;

· oskgo opened on Sep 8, 2024

Compiler hang with recursive trait requirement and <code>default impl</code>

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

min_specialization on local types should take impls into account to determine whether a trait can be specialized on

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

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.

#113452 In rust-lang/rust;

· the8472 opened on Jul 7, 2023

Cow&lt;'a, T&gt; isn't specializable while FooCow&lt;'a, T&gt; is

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)]`

requires-incomplete-featuresThis issue requires the use of incomplete features.This issue requires the use of incomplete features.

Status: Open.

#106710 In rust-lang/rust;

· ryoqun opened on Jan 11, 2023

Specialized Associated Type Cannot be Assigned to Value of Concrete Type (Despite type_name Working as Expected)

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)]`

Status: Open.

#106700 In rust-lang/rust;

· NathanielB123 opened on Jan 11, 2023

ICE: <code>rustc_specialization_trait</code> and circular associated type

A-specializationArea: Trait impl specializationArea: Trait impl specialization

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

F-rustc_attrsInternal rustc attributes gated on the `#[rustc_attrs]` feature gate.Internal rustc attributes gated on the `#[rustc_attrs]` feature gate.

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

glacierICE tracked in rust-lang/glacier.ICE tracked in rust-lang/glacier.

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

requires-internal-featuresThis issue requires the use of internal features.This issue requires the use of internal features.

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

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.

#102252 In rust-lang/rust;

· ChaiTRex opened on Sep 25, 2022

Zero-length arrays are non-<code>Copy</code>.

A-arrayArea: `[T; N]`Area: `[T; N]`

A-specializationArea: Trait impl specializationArea: Trait impl specialization

A-trait-systemArea: Trait systemArea: Trait system

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.

#94313 In rust-lang/rust;

· JohnScience opened on Feb 24, 2022

Strange behavior when specializing over a generic trait parameter

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)]`

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.

#91973 In rust-lang/rust;

· joergbrech opened on Dec 15, 2021