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Tail calls don't enforce lifetime constraints from return type onto args

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

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

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

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

Status: Open.

#144916 In rust-lang/rust;

· compiler-errors opened on Aug 4, 2025

Coroutine upvars are not required to be live in borrowck if witness has no drop requirements

A-async-awaitArea: Async & AwaitArea: Async & Await

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

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

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-criticalCritical priorityCritical priority

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

Status: Open.

#144155 In rust-lang/rust;

· compiler-errors opened on Jul 18, 2025

(re-)Fix private-in-public for RPITIT

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

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

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.

#144139 In rust-lang/rust;

· compiler-errors opened on Jul 18, 2025

Trivial bounds check doesn't consider non-global predicates *after* normalization

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

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.

#140309 In rust-lang/rust;

· compiler-errors opened on Apr 25, 2025

Incomplete inference guidance due to <code>Sized</code> param-env clause causes method selection failure

A-inferenceArea: Type inferenceArea: Type inference

A-trait-systemArea: Trait systemArea: Trait system

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

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

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.

#137812 In rust-lang/rust;

· compiler-errors opened on Feb 28, 2025

Presence of lifetime params on free consts shouldn't affect evaluatability &amp; impossible preds should prevent evaluation

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

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

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.

#136204 In rust-lang/rust;

· compiler-errors opened on Jan 28, 2025

<code>compare_method_predicate_entailment</code> is missing implied bounds from higher-ranked GAT

A-GATsArea: Generic associated types (GATs)Area: Generic associated types (GATs)

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

A-implied-boundsArea: Implied bounds / inferred outlives-boundsArea: Implied bounds / inferred outlives-bounds

A-trait-systemArea: Trait systemArea: Trait system

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

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.

#133805 In rust-lang/rust;

· compiler-errors opened on Dec 3, 2024

Stack overflow with <code>clashing_extern_declarations</code>

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

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

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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.

#130947 In rust-lang/rust;

· compiler-errors opened on Sep 27, 2024

<code>repr_transparent_external_private_fields</code> lint is not totally clear about what exactly triggers the lint

A-lintsArea: Lints (warnings about flaws in source code) such as unused_mut.Area: Lints (warnings about flaws in source code) such as unused_mut.

A-reprArea: the `#[repr(stuff)]` attributeArea: the `#[repr(stuff)]` attribute

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

L-repr_transparent_external_private_fieldsLint: repr_transparent_external_private_fieldsLint: repr_transparent_external_private_fields

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.

#115956 In rust-lang/rust;

· compiler-errors opened on Sep 19, 2023

Mysterious "higher-ranked lifetime error" with async fn in trait and return-type notation

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

A-NLLArea: Non-lexical lifetimes (NLL)Area: Non-lexical lifetimes (NLL)

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

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

F-async_fn_in_traitStatic async fn in traitsStatic async fn in traits

F-return_type_notation`#[feature(return_type_notation)]``#[feature(return_type_notation)]`

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

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.

#110963 In rust-lang/rust;

· compiler-errors opened on Apr 28, 2023

hrtb + infer types break auto traits with return type notation

A-auto-traitsArea: auto traits (e.g., `auto trait Send {}`)Area: auto traits (e.g., `auto trait Send {}`)

A-higher-rankedArea: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)Area: Higher-ranked things (e.g., lifetimes, types, trait bounds aka HRTBs)

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

F-return_type_notation`#[feature(return_type_notation)]``#[feature(return_type_notation)]`

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.

#109924 In rust-lang/rust;

· compiler-errors opened on Apr 4, 2023

Weird interaction between specialization and RPITITs

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

F-async_fn_in_traitStatic async fn in traitsStatic async fn in traits

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

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

#108309 In rust-lang/rust;

· compiler-errors opened on Feb 21, 2023