async/await: improve not-send errors, part 2#65345

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bors merged 3 commits intorust-lang:masterfrom

davidtwco:issue-64130-async-send-sync-error-improvements

Dec 11, 2019

Commits on Dec 8, 2019

Commits on Dec 11, 2019

erase regions instead of using `builtin_deref`
Nicholas Matsakis
committed