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ICE: cannot find .. in param-env: ParamEnv

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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.

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.

#148096 In rust-lang/rust;

· matthiaskrgr opened on Oct 25, 2025

<code>thread_local!</code> doesn’t like types whose definitions cannot be written more than once

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

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

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.

#147103 In rust-lang/rust;

· Jules-Bertholet opened on Sep 27, 2025

Const generics do not accept exhaustive trait impls

A-coherenceArea: CoherenceArea: Coherence

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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.

#146962 In rust-lang/rust;

· clarfonthey opened on Sep 24, 2025

ICE: <code>assertion failed: layout.is_sized()</code>

A-const-evalArea: Constant evaluation, covers all const contexts (static, const fn, ...)Area: Constant evaluation, covers all const contexts (static, const fn, ...)

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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.

#146084 In rust-lang/rust;

· levinwinter opened on Sep 1, 2025

Compiler doesn’t allow creating u8 slices when using const generics

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

A-repr-packedArea: the naughtiest reprArea: the naughtiest repr

A-sliceArea: `[T]`Area: `[T]`

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

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.

#145376 In rust-lang/rust;

· gralpli opened on Aug 14, 2025

Trait solver fails to see trait is implemented for all values of const generic param

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

A-trait-systemArea: Trait systemArea: Trait system

C-feature-requestCategory: A feature request, i.e: not implemented / a PR.Category: A feature request, i.e: not implemented / a PR.

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.

#145133 In rust-lang/rust;

· Keaudes opened on Aug 8, 2025

2025-07-18 regression: cycle detected when computing revealed normalized predicates

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

Status: Open.

#144690 In rust-lang/rust;

· nazar-pc opened on Jul 30, 2025

<code>generic_const_exprs</code> doesn't evaluate <code>size_of::&lt;T&gt;()</code> if <code>T</code> has a generic

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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.

#144021 In rust-lang/rust;

· SuperSamus opened on Jul 16, 2025

Baffling suggestion labelled "help: try introducing a local generic parameter here"

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

D-invalid-suggestionDiagnostics: A structured suggestion resulting in incorrect code.Diagnostics: A structured suggestion resulting in incorrect code.

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

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.

#141872 In rust-lang/rust;

· nabijaczleweli opened on Jun 1, 2025

ICE: <code>bad placeholder constant</code>

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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

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.

#141845 In rust-lang/rust;

· matthiaskrgr opened on Jun 1, 2025

rustdoc query cycle regression

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

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-rustdocRelevant to the rustdoc team, which will review and decide on the PR/issue.Relevant to the rustdoc team, which will review and decide on the PR/issue.

Status: Open.

#141492 In rust-lang/rust;

· BoxyUwU opened on May 24, 2025

ICE:called <code>Option::unwrap()</code> on a <code>None</code> value

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

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

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

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.

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.

#140891 In rust-lang/rust;

· sososopy opened on May 10, 2025