Rollup of 8 pull requests#62219

Closed

Centril wants to merge 33 commits intorust-lang:masterfrom

Centril:rollup-94tkrb4

Commits on Jun 8, 2019

Commits on Jun 9, 2019

Fix more tests after revert of rustdoc cfg(test) feature
ollie27
committed

Commits on Jun 25, 2019

Commits on Jun 27, 2019

Implement mem::{zeroed,uninitialized} in terms of MaybeUninit.
alex
committed

Commits on Jun 28, 2019