[stable] 1.52.0 release#84864

Merged

bors merged 18 commits intorust-lang:stablefrom

Mark-Simulacrum:stable-next

May 3, 2021

Commits on May 3, 2021

bump channel to stable
Mark-Simulacrum
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Cherry-pick release notes
Mark-Simulacrum
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Effective beta backport of 8d1083e319841624f64400e1524805a40d725439

pnkfelix
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Remove tests introduced or cahnged by PR #77885, which is reverted in this PR.

pnkfelix
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Revert "Add assert_matches!(expr, pat)."
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Revert "Add debug_assert_matches macro."
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Remove assert_matches users
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Remove assert_matches feature attributes.

m-ou-se
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Revert PR 81473 to resolve (on beta) issues 81626 and 81658.

pnkfelix
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beta-targetted revert of PR #80653, to address issue #82465.

pnkfelix
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regression test for issue 82465.

pnkfelix
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placate tidy.

pnkfelix
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Revert "directly expose copy and copy_nonoverlapping intrinsics"
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Revert "Fix clippy's path to the copy intrinsics."
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drop some const unstables, due to revert no longer possible
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Fix ICE of for-loop mut borrowck where no suggestions are available

fee1-dead
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Remove some more consts
Mark-Simulacrum
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remove copy intrinsic test - no longer const
Mark-Simulacrum
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