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Tracking issue for MCP 996: Test new solver and polonius alpha on CI

B-MCP-approvedBlocker: Approved by an accepted MCP but not yet fully implemented.Blocker: Approved by an accepted MCP but not yet fully implemented.

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

S-tracking-unimplementedStatus: The feature has not been implemented.Status: The feature has not been implemented.

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.

#157780 In rust-lang/rust;

· rustbot opened on Jun 11, 2026

[ICE]: assumptions on binders: assertion failed: max_universe(infcx, constraint.clone()) < u

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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

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

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

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.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open.

#157778 In rust-lang/rust;

· matthiaskrgr opened on Jun 11, 2026

[ICE]: inferred lifetime in signature

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

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) ❄️

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.

#157777 In rust-lang/rust;

· matthiaskrgr opened on Jun 11, 2026

[ICE]: assumptions on binders: item_bounds called on DefId

-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-bindersUnstable option: `-Zassumptions-on-binders

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

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

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.

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open.

#157774 In rust-lang/rust;

· matthiaskrgr opened on Jun 11, 2026

[ICE]: node_type: no type for node HirId

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

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

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) ❄️

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.

#157772 In rust-lang/rust;

· matthiaskrgr opened on Jun 11, 2026

Tracking issue for release notes of #149543: Reduce unreachable-code churn after todo!()

A-run-makeArea: port run-make Makefiles to rmake.rsArea: port run-make Makefiles to rmake.rs

A-rustdoc-jsonArea: Rustdoc JSON backendArea: Rustdoc JSON backend

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

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.

relnotesMarks issues that should be documented in the release notes of the next release.Marks issues that should be documented in the release notes of the next release.

relnotes-tracking-issueMarks issues tracking what text to put in release notes.Marks issues tracking what text to put in release notes.

T-clippyRelevant to the Clippy team.Relevant to the Clippy team.

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

WG-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open.

#157767 In rust-lang/rust;

· rustbot opened on Jun 11, 2026

Excessive rustc memory usage and compile time

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

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.

Status: Open.

#157764 In rust-lang/rust;

· imre-kis-arm opened on Jun 11, 2026

False positive of lint missing_debug_implementations if Debug is implemented for an alias type (e.g., projection) that can get normalized to the relevant type

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.

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-missing_debug_implementationsLint: missing_debug_implementationsLint: missing_debug_implementations

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.

#157758 In rust-lang/rust;

· fmease opened on Jun 11, 2026

False positive of lint missing_debug_implementations if Debug is implemented for a free alias type that expands to the relevant type

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.

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

L-false-positiveLint: False positive (should not have fired).Lint: False positive (should not have fired).

L-missing_debug_implementationsLint: missing_debug_implementationsLint: missing_debug_implementations

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.

#157757 In rust-lang/rust;

· fmease opened on Jun 11, 2026

Cannot impl auto traits for free alias types that expand to otherwise legal self type

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

A-coherenceArea: CoherenceArea: Coherence

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

F-lazy_type_alias`#![feature(lazy_type_alias)]``#![feature(lazy_type_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.

#157756 In rust-lang/rust;

· fmease opened on Jun 11, 2026

Cannot implement certain built-in traits like Copy or Drop for free alias types that expand to otherwise legal self type

A-coherenceArea: CoherenceArea: Coherence

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

F-lazy_type_alias`#![feature(lazy_type_alias)]``#![feature(lazy_type_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.

#157755 In rust-lang/rust;

· fmease opened on Jun 11, 2026

step_by() on new ranges is less optimized than the old ranges.

A-iteratorsArea: IteratorsArea: Iterators

A-specializationArea: Trait impl specializationArea: Trait impl specialization

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

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

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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-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.

#157754 In rust-lang/rust;

· theemathas opened on Jun 11, 2026