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Draft release notes for 1.88.0
#141598 opened May 26, 2025 by Mark-Simulacrum
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Issues list

ICE: layout_of: unexpected type C-bug Category: This is a bug. F-transmutability `#![feature(transmutability)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141400 opened May 22, 2025 by cushionbadak
2
ICE: Failed to normalize Alias(Free, AliasTy { C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#141380 opened May 22, 2025 by matthiaskrgr
7
impl block on a type defined with type_alias_impl_trait can conflict with other unrelated impl A-coherence Area: Coherence A-hygiene Area: Macro hygiene C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#139583 opened Apr 9, 2025 by douglas-raillard-arm
2
ICE: un_derefer: index out of bounds C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#139556 opened Apr 8, 2025 by matthiaskrgr
2
TAIT: combining those types cannot compile C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#139003 opened Mar 26, 2025 by Ddystopia
2
TAIT: allow using '_ to reference the current lifetime C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#138620 opened Mar 17, 2025 by erickt
ICE: failed to normalize in build_adt_ctor with TAIT C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#137049 opened Feb 14, 2025 by lukas-code
Compiler stack overflow when calling function on generic struct with TAIT resolving to lambda C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. S-has-bisection Status: A bisection has been found for this issue 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.
#136390 opened Feb 1, 2025 by Elekrisk
5
ICE during orphanck with the next solver involving opaque type "covered" by a fundamental type A-coherence Area: Coherence C-bug Category: This is a bug. F-fundamental `#![feature(fundamental)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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. 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. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
#136188 opened Jan 28, 2025 by fmease
1
@fmease
1
"expected opaque type, found ..." when trait impl with type_alias_impl_trait C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#136142 opened Jan 27, 2025 by MabaKalox
1
Orphanck: Reject uncovered opaque types F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` rla-silenced Silences rust-log-analyzer postings to the PR it's added on. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-trait-system-refactor The Rustc Trait System Refactor Initiative (-Znext-solver)
#135910 opened Jan 23, 2025 by fmease • Draft
2
@lcnr
6
Hang: type_alias_impl_trait C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` I-compilemem Issue: Problems and improvements with respect to memory usage during compilation. I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132797 opened Nov 9, 2024 by wxie7
3
ICE: Unsize coercion, but &dyn Foo<'_> isn't coercible to &dyn Bar<'_, '_, ()> -Zvalidate-mir Unstable option: MIR validation C-bug Category: This is a bug. F-trait_upcasting `#![feature(trait_upcasting)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#131886 opened Oct 18, 2024 by matthiaskrgr
3
TAIT coherence checks don't ensure composability of crates A-coherence Area: Coherence A-trait-system Area: Trait system C-bug Category: This is a bug. F-impl_trait_in_assoc_type `#![feature(impl_trait_in_assoc_type)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` requires-nightly This issue requires a nightly compiler in some way. T-types Relevant to the types team, which will review and decide on the PR/issue.
#130978 opened Sep 28, 2024 by steffahn
1
@fmease
5
ICE: unhandled type: Alias(...) in rustc_mir_transform/src/validate.rs when [mir_built] C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#126680 opened Jun 19, 2024 by cushionbadak
2
ICE: icnr comp: type variable should not be hashed A-incr-comp Area: Incremental compilation C-bug Category: This is a bug. F-transmutability `#![feature(transmutability)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#125885 opened Jun 2, 2024 by matthiaskrgr
1
ICE: could not resolve upvar: LocalVarId(HirId(DefId))) C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#125553 opened May 25, 2024 by matthiaskrgr
ICE: unhandled type: {type error} -Zvalidate-mir Unstable option: MIR validation C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#125185 opened May 16, 2024 by matthiaskrgr
Passing pointer to value of type alias with impl Trait through function breaks this type C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#123983 opened Apr 15, 2024 by nikvoid
4
ICE: {OpaqueTypeKey { def_id: DefId .. C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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. 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.
#123157 opened Mar 28, 2024 by matthiaskrgr
@oli-obk
2
Confusing behavior and mismatched error reports for impl_trait_in_fn_trait_return && type_alias_impl_trait C-bug Category: This is a bug. F-impl_trait_in_fn_trait_return `#![feature(impl_trait_in_fn_trait_return)]` F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#122279 opened Mar 10, 2024 by Jedsek
1
rustdoc: ICE: synthetic auto trait impls: unexpected region: RePlaceholder[…] involving TAIT A-auto-traits Area: auto traits (e.g., `auto trait Send {}`) A-lifetimes Area: Lifetimes / regions A-synthetic-impls Area: Synthetic impls, used by rustdoc to document auto traits and traits with blanket impls C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ 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-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue.
#120606 opened Feb 3, 2024 by Sherlock-Holo
@fmease
1
ice: type mismatch when copying C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` 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.
#120016 opened Jan 16, 2024 by matthiaskrgr
5
TAIT applies type constraints backwards where variable type is already fully constrained A-diagnostics Area: Messages for errors, warnings, and lints C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119513 opened Jan 2, 2024 by BattyBoopers
4
Conflict implementation when upstream crate has any impl for any type_alias_impl_trait type A-coherence Area: Coherence A-trait-system Area: Trait system C-bug Category: This is a bug. F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-types Relevant to the types team, which will review and decide on the PR/issue.
#119318 opened Dec 26, 2023 by mikialex
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