Rollup of 10 pull requests#77013

Merged

bors merged 21 commits intorust-lang:masterfrom

RalfJung:rollup-84ut0xq

Sep 21, 2020

Commits on Sep 8, 2020

Add error explanation for E0755
GuillaumeGomez
committed

Commits on Sep 9, 2020

Commits on Sep 17, 2020

make replace_prefix only take &str as arguments
matthiaskrgr
committed

Commits on Sep 21, 2020