Rollup of 8 pull requests#85486

Merged

bors merged 21 commits intorust-lang:masterfrom

RalfJung:rollup-4ibcxuu

May 20, 2021

Commits on May 14, 2021

Expose `Concurrent` (private type in public i'face)
eggyal
committed

Commits on May 15, 2021

adding time complexity for partition_in_place iter method
Satyarth Agrahari
committed

Commits on May 18, 2021

adding algorithm explanation for partition_in_place iter method and bounding complexity to current implementation
Satyarth Agrahari
committed
Add diagnostic item to `CStr`
mgacek8
committed

Commits on May 19, 2021