Rollup of 6 pull requests#70638

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rust-lang:masterfrom

Dylan-DPC-zz:rollup-2tgfxjt

Apr 1, 2020

Commits on Mar 27, 2020

Commits on Mar 29, 2020

Commits on Mar 30, 2020

parse_and_disallow_postfix_after_cast: account for `ExprKind::Err`.
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Commits on Mar 31, 2020