Rollup of 12 pull requests#74073

Merged

bors merged 34 commits intorust-lang:masterfrom

Manishearth:rollup-faqo9lx

Jul 6, 2020

Commits on May 27, 2020

added .collect() into String from Box<str> with fake feature/stability annotation
djugei
committed

Commits on Jun 27, 2020

Commits on Jun 28, 2020

Add preamable on rustc-attrs doc discussion
pickfire
committed

Commits on Jun 29, 2020

Commits on Jul 1, 2020

Review fix
da-x
committed

Commits on Jul 2, 2020

Use `Span`s to identify unreachable subpatterns in or-patterns
Nadrieril
committed

Commits on Jul 4, 2020

Commits on Jul 5, 2020