[beta] Rollup backports#72468

Merged

bors merged 4 commits intorust-lang:betafrom

Elinvynia:backport

May 23, 2020

Commits on May 22, 2020

Bump pulldown-cmark

ehuss
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Elinvynia
committed
Fix E0284 to not use incorrect wording

estebank
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Elinvynia
committed
Fix hang in lexical_region_resolve

matthewjasper
authored and
Elinvynia
committed
Fail if I/O error occurs during testing

Mark-Simulacrum
authored and
Elinvynia
committed