Rollup of 4 pull requests#72555

Closed

Dylan-DPC-zz wants to merge 12 commits intorust-lang:masterfrom

Dylan-DPC-zz:rollup-x4g4alk

Commits on May 22, 2020

Implement `Sync` for `process::Command on unix and vxworks
LeSeulArtichaut
committed

Commits on May 23, 2020