Rollup of 9 pull requests#63341

Merged

bors merged 24 commits intorust-lang:masterfrom

Centril:rollup-hkhxahb

Aug 7, 2019

Commits on Jul 29, 2019

Wrap promoted generator fields in MaybeUninit
tmandry
committed

Commits on Jul 31, 2019

add a pair of whitespace after remove parentheses
bravomikekilo
committed

Commits on Aug 2, 2019

Commits on Aug 3, 2019

Add niche-in-generator test
tmandry
committed

Commits on Aug 4, 2019

test .await while holding variables of different sizes
alsuren
committed

Commits on Aug 6, 2019