Rollup of 5 pull requests#69484

Merged

bors merged 19 commits into

rust-lang:masterfrom

Dylan-DPC-zz:rollup-j6ripxy

Feb 26, 2020

Commits on Jan 31, 2020

Add methods to leak RefCell borrows to references
197g
committed

Commits on Feb 12, 2020

Add tracking number, adjust documentation wording
197g
committed

Commits on Feb 15, 2020

Formatter::sign is &'static str
Mark-Simulacrum
committed

Commits on Feb 17, 2020

Commits on Feb 22, 2020

Allow getting `no_std` from the config file
Ericson2314
committed

Commits on Feb 25, 2020