Rollup of 6 pull requests#69226

Merged

bors merged 15 commits intorust-lang:masterfrom

JohnTitor:rollup-syn03oj

Feb 17, 2020

Commits on Jan 23, 2020

Updating str.chars docs to mention crates.io.
sdegutis
authored

Commits on Feb 14, 2020

Don't print block exit state if unchanged
ecstatic-morse
committed

Commits on Feb 16, 2020

Improve #Safety of core::ptr::drop_in_place
amosonn
committed

Commits on Feb 17, 2020