Rollup of 15 pull requests#76937

Closed

RalfJung wants to merge 38 commits intorust-lang:masterfrom

RalfJung:rollup-jjvtux5

Commits on Sep 9, 2020

Commits on Sep 15, 2020

Test and fix Sync & Send traits of BTreeMap artefacts
ssomers
committed

Commits on Sep 16, 2020

Commits on Sep 17, 2020

Commits on Sep 18, 2020

Remove unused libc feature gate
est31
committed
Apply suggestions from code review

poliorcetics
and
Joshua Nelson
authored
Remove some unused features from alloc core and std
est31
committed

Commits on Sep 19, 2020