Rollup of 7 pull requests#74810

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Manishearth wants to merge 17 commits intorust-lang:masterfrom

Manishearth:rollup-wmo68l2

Commits on Jul 25, 2020

Commits on Jul 27, 2020

Rollup merge of #74088 - tmiasko:write-all-vectored-empty, r=KodrAus
Manishearth
authored
Rollup merge of #74707 - matklad:split_once, r=dtolnay
Manishearth
authored
Rollup merge of #74737 - smmalis37:astconv-factor, r=davidtwco
Manishearth
authored
Rollup merge of #74750 - oli-obk:logging_and_test_cleanups, r=JohnTitor
Manishearth
authored
Rollup merge of #74783 - jnozsc:python_cleanup, r=Mark-Simulacrum
Manishearth
authored
Rollup merge of #74785 - euclio:deprecation-kinds, r=petrochenkov
Manishearth
authored
Rollup merge of #74790 - Cldfire:ayu-no-italic-comments, r=GuillaumeGomez
Manishearth
authored