Rollup of 10 pull requests#83105

Merged

bors merged 24 commits intorust-lang:masterfrom

JohnTitor:rollup-tqpm8pb

Mar 14, 2021

Commits on Feb 14, 2021

Implement Extend and FromIterator for OsString
lopopolo
committed

Commits on Feb 16, 2021

Optimize FromIterator<OsString> to reuse the first allocation
lopopolo
committed

Commits on Mar 3, 2021

Add impls for iterators of Cow<OsStr>
lopopolo
committed

Commits on Mar 5, 2021

Commits on Mar 9, 2021

Demonstrate best practice for feeding stdin of a child processes
kornelski
committed

Commits on Mar 11, 2021

Commits on Mar 14, 2021