[beta] backport rollup#70244

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bors merged 5 commits intorust-lang:betafrom

Mark-Simulacrum:beta-next

Mar 22, 2020

Commits on Mar 21, 2020

Update stdarch submodule

Amanieu
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Mark-Simulacrum
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ci: use python from the correct path

pietroalbini
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can_begin_literal_maybe_minus: `true` on `"-"? lit` NTs.

Centril
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Mark-Simulacrum
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Use a non-dev-static toolchain
Mark-Simulacrum
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Beta: Update cargo, clippy

ehuss
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Mark-Simulacrum
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