Rollup of 8 pull requests#107650

Merged

bors merged 18 commits intorust-lang:masterfrom

compiler-errors:rollup-4pntchf

Feb 4, 2023

Commits on Jan 31, 2023

std: add type alias for raw OS errors
joboet
committed

Commits on Feb 1, 2023

fix parser mistaking const closures for const item
fee1-dead
committed

Commits on Feb 2, 2023

Retry opening proc-macro DLLs a few times on Windows.
michaelwoerister
committed

Commits on Feb 3, 2023