Rollup of 6 pull requests#74817

Merged

bors merged 14 commits intorust-lang:masterfrom

JohnTitor:rollup-0fchdye

Jul 27, 2020

Commits on Jul 21, 2020

Fix sync_once_cell_does_not_leak_partially_constructed_boxes
mzohreva
committed

Commits on Jul 25, 2020

Clean up some uses of logging in ui tests
oli-obk
committed

Commits on Jul 27, 2020