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Make trait aliases eligible generic containers wrt. ambient object lifetime defaults

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

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-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.

#140710 In rust-lang/rust;

· fmease opened on May 6, 2025

ICE: <code>encountered a fresh type during canonicalization</code>

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

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

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

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

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.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

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.

#138891 In rust-lang/rust;

· matthiaskrgr opened on Mar 24, 2025

ICE: <code>args not compatible with generics for ..</code>

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

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

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

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

P-lowLow priorityLow priority

requires-debug-assertionsThis issue requires a build of rustc or tooling with debug-assertions in some wayThis issue requires a build of rustc or tooling with debug-assertions in some way

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

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.

#137514 In rust-lang/rust;

· matthiaskrgr opened on Feb 24, 2025

RFC #1733 (Trait Aliases): use of lifetime parameter in trait alias not detected

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

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

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

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

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.

#127725 In rust-lang/rust;

· ilonachan opened on Jul 14, 2024

Compiler wants to add bound which already exists to generic.

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

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

A-trait-systemArea: Trait systemArea: Trait system

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

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

fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.Fixed by the next-generation trait solver, `-Znext-solver`.

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.

#123513 In rust-lang/rust;

· meltah opened on Apr 5, 2024

Error in specialization type checking when using trait aliases

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)]`

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

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

Status: Open.

#74809 In rust-lang/rust;

· jsmith628 opened on Jul 27, 2020

Parameter usage is not properly propagated through trait aliases

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

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

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.

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.

#74093 In rust-lang/rust;

· vandenheuvel opened on Jul 6, 2020

The bounds information of associated types is not propagated correctly when used with trait aliases.

A-trait-systemArea: Trait systemArea: Trait system

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

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

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.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#68210 In rust-lang/rust;

· wdanilo opened on Jan 14, 2020

Fix <code>trait_ref_to_existential</code> as trait aliases is stabilized

A-dyn-compatibilityArea: Dyn compatibility (formerly: object safety)Area: Dyn compatibility (formerly: object safety)

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

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

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

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.

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.

#66420 In rust-lang/rust;

· estebank opened on Nov 14, 2019

Tracking issue for trait aliases

A-trait-systemArea: Trait systemArea: Trait system

B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.Blocker: Approved by a merged RFC but not yet implemented.

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

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-trait_alias`#![feature(trait_alias)]``#![feature(trait_alias)]`

S-tracking-needs-summaryStatus: It's hard to tell what's been done and what hasn't! Someone should do some investigation.Status: It's hard to tell what's been done and what hasn't! Someone should do some investigation.

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#41517 In rust-lang/rust;

· withoutboats opened on Apr 24, 2017