Top rust issues

'a: while break 'a{} results in illigal instruction

A-typesystem C-bug I-unsound 💥 P-medium T-compiler regression-from-stable-to-stable

impl Trait is allowed in the return type of main

I-nominated T-compiler

Unify `CanonicalVar` and `DebruijnIndex`

A-traits C-enhancement T-compiler WG-compiler-traits chalk-integration

Rust 1.25.0 regressed the performance of encoding_rs's UTF-8 validation on i686

A-LLVM I-slow P-medium WG-codegen regression-from-stable-to-stable

Tracking issue for RFC 2102, "Unnamed fields of struct and union type"

B-RFC-approved C-tracking-issue E-help-wanted T-lang

Reject bounds in type aliases with edition 2018

A-traits A-typesystem C-enhancement T-lang WG-epoch

🛠️ specialization permits empty impls when parent has no default items

A-specialization A-traits C-enhancement F-specialization T-compiler WG-compiler-traits requires-nightly

Tracking issue for RFC #2166: impl-only-use

B-RFC-approved C-tracking-issue T-lang

CondVar wait functions accepting a closure

A-concurrency B-unstable C-tracking-issue T-libs

Regression in the Debug formatter

T-libs regression-from-stable-to-beta