[beta] backports#85588

Merged

bors merged 11 commits intorust-lang:betafrom

Mark-Simulacrum:beta-next

May 23, 2021

Commits on May 22, 2021

backport 1.52.1 release notes

pietroalbini
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remove InPlaceIterable marker from Peekable due to unsoundness

the8472
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add regression test

the8472
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from review: more robust test

authored and
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Call `initSidebarItems` in root module of crate

Stupremee
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Synchronize llvm to master commit
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Do not ICE on invalid const param

estebank
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Disallows `#![feature(no_coverage)]` on stable and beta

richkadel
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Ensure TLS destructors run before thread joins in SGX

mzohreva
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Use atomics in join_orders_after_tls_destructors test

mzohreva
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join_orders_after_tls_destructors: ensure thread 2 is launched before thread 1 enters TLS destructors

mzohreva
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Mark-Simulacrum
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