Rollup of 7 pull requests#78060

Merged

bors merged 15 commits intorust-lang:masterfrom

JohnTitor:rollup-uou8vyu

Oct 17, 2020

Commits on Sep 15, 2020

Modify executable checking to be more universal
Mark-Simulacrum
committed

Commits on Oct 12, 2020

BTreeMap: refactor Entry out of map.rs into its own file
Jacob Hughes
committed

Commits on Oct 17, 2020