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Issues list

ICE: When translating generic parameters from DefId, the expected specialization failed to hold C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-incomplete-features This issue requires the use of incomplete features. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132519 opened Nov 2, 2024 by matthiaskrgr
1
ICE :coherence: impl was matchable against Binder but now it is not, otherwise hang C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` fixed-by-next-solver Fixed by the next-generation trait solver, `-Znext-solver`. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125014 opened May 11, 2024 by matthiaskrgr
1
query cycle: specialisation cycle detected when building specialization graph of trait A-diagnostics Area: Messages for errors, warnings, and lints F-specialization `#![feature(specialization)]` I-cycle Issue: A query cycle occurred while none was expected T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119344 opened Dec 27, 2023 by matthiaskrgr
2
Compiler hang with recursive trait requirement and default impl A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` I-compiletime Issue: Problems and improvements with respect to compile times. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#117909 opened Nov 14, 2023 by jruderman
2
Invalid help suggestion for specialization on associated type with Self A-diagnostics Area: Messages for errors, warnings, and lints F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#117841 opened Nov 12, 2023 by polina4096
Weird interaction between specialization and RPITITs C-bug Category: This is a bug. F-async_fn_in_trait Static async fn in traits F-return_position_impl_trait_in_trait `#![feature(return_position_impl_trait_in_trait)]` F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#108309 opened Feb 21, 2023 by compiler-errors
1
@compiler-errors
3
Cow<'a, T> isn't specializable while FooCow<'a, T> is A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` requires-incomplete-features This issue requires the use of incomplete features.
#106710 opened Jan 11, 2023 by ryoqun
1
Specialized Associated Type Cannot be Assigned to Value of Concrete Type (Despite type_name Working as Expected) A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]`
#106700 opened Jan 11, 2023 by NathanielB123
2
ICE "... is not fully resolved'" with min_specialization and lifetime param C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#103708 opened Oct 29, 2022 by jruderman
@compiler-errors
5
ICE: rustc_specialization_trait and circular associated type A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-rustc_attrs Internal rustc attributes gated on the `#[rustc_attrs]` feature gate. F-specialization `#![feature(specialization)]` glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-internal-features This issue requires the use of internal features. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#102252 opened Sep 25, 2022 by ChaiTRex
1
2
default impl SuperTrait for impl SubTrait => trait requirement evaluation overflow C-bug Category: This is a bug. F-specialization `#![feature(specialization)]`
#98478 opened Jun 25, 2022 by CAD97
1
Specialized associated type doesn't have impls that it should have A-trait-system Area: Trait system C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#98389 opened Jun 22, 2022 by ivan770
2
Diagnostic regression when rustc cannot specialize (using min_specialization) A-diagnostics Area: Messages for errors, warnings, and lints F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#97296 opened May 22, 2022 by robinmoussu
ICE in compiler/rustc_monomorphize/src/collector.rs when combining #[marker] and min_specialization C-bug Category: This is a bug. F-marker_trait_attr `#![feature(marker_trait_attr)]` F-specialization `#![feature(specialization)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
#96235 opened Apr 20, 2022 by the8472
Strange behavior when specializing over a generic trait parameter A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#91973 opened Dec 15, 2021 by joergbrech
1
Diagnostic forgets about transitive trait bounds when there are multiple candidate impls. A-diagnostics Area: Messages for errors, warnings, and lints A-specialization Area: Trait impl specialization A-trait-system Area: Trait system D-confusing Diagnostics: Confusing error or lint that should be reworked. D-terse Diagnostics: An error or lint that doesn't give enough information about the problem at hand. F-rustc_attrs Internal rustc attributes gated on the `#[rustc_attrs]` feature gate. F-specialization `#![feature(specialization)]` requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#90665 opened Nov 7, 2021 by BGR360
8
ICE in improper_ctypes lint for specialised associated type default A-lints Area: Lints (warnings about flaws in source code) such as unused_mut. C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ L-improper_ctypes Lint: improper_ctypes requires-incomplete-features This issue requires the use of incomplete features. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#88296 opened Aug 24, 2021 by juntyr
2
Specialization on associated type A-diagnostics Area: Messages for errors, warnings, and lints A-specialization Area: Trait impl specialization C-bug Category: This is a bug. D-confusing Diagnostics: Confusing error or lint that should be reworked. F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#85228 opened May 12, 2021 by vandenheuvel
3
Conflicing implementation through specialized default implementation A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]`
#81376 opened Jan 25, 2021 by vandenheuvel
1
Overflow in checking recursive trait requirements with specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#80700 opened Jan 4, 2021 by willcrichton
compiler crash using specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#77026 opened Sep 21, 2020 by avl
3
Error in specialization type checking when using trait aliases A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` F-trait_alias `#![feature(trait_alias)]` requires-nightly This issue requires a nightly compiler in some way.
#74809 opened Jul 27, 2020 by jsmith628
#[track_caller] should inherit through specialization ancestors, too? A-specialization Area: Trait impl specialization F-specialization `#![feature(specialization)]` F-track_caller `#![feature(track_caller)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-lang Relevant to the language team, which will review and decide on the PR/issue.
#70293 opened Mar 23, 2020 by anp
2
Spurious 'conflicting implementations' error when specializing a type with a compilation error A-diagnostics Area: Messages for errors, warnings, and lints A-specialization Area: Trait impl specialization C-bug Category: This is a bug. D-verbose Diagnostics: Too much output caused by a single piece of incorrect code. E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. F-specialization `#![feature(specialization)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#68830 opened Feb 4, 2020 by Aaron1011
1
2
specialization: default impl is used, ignoring the vtable of original value A-specialization Area: Trait impl specialization C-bug Category: This is a bug. F-specialization `#![feature(specialization)]` requires-nightly This issue requires a nightly compiler in some way. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#68564 opened Jan 27, 2020 by kdy1
2
ProTip! Updated in the last three days: updated:>2025-05-05.