Top rust issues

return of #39347: feature(proc_macro) breaks attributes on custom derive

A-macros-2.0 C-bug

Pathological performance in resolve with lots of unused imports in `style` crate

C-bug I-compiletime T-compiler

Add IRC's `!union union` as a test

C-enhancement E-easy E-needs-test P-low T-compiler

Rust 1.20 regression, for_each 0.2.0, conflicts with unstable iterator_for_each feature

C-bug I-nominated P-high T-libs regression-from-stable-to-beta

Call clone on a reference may just clone the reference

Should doctests on local `let` statements be found / executed?

C-bug I-needs-decision T-dev-tools T-lang T-rustdoc

Create and publish a snap of Rust

A-rustbuild C-feature-request E-help-wanted T-infra

Tracking issue for "Red/Green" Dependency Tracking

A-incr-comp C-tracking-issue T-compiler metabug

Broken match statement when compiling for thumbv6-none-eabi (ARM cortex-m0)

A-LLVM O-ARM P-high T-compiler regression-from-stable-to-nightly

Warn on unused lifetime parameters

A-diagnostics A-lint C-feature-request T-compiler