Sync with v0.8 branch #2519

Job	Run time
careful	5m 15s
dependencies	16s
codegen	26s
clippy	20s
docs	13s
features (1.61)	30s
loom	54s
features (nightly)	24s
miri	20m 2s
rustfmt	13s
san	13m 45s
shellcheck	9s
test (1.61, ubuntu-latest)	11m 12s
test (1.61, windows-latest)	15m 12s
test (stable, ubuntu-latest)	9m 48s
test (stable, windows-latest)	13m 47s
test (nightly, ubuntu-latest)	9m 46s
test (nightly, windows-latest)	13m 43s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	10m 6s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	14m 25s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	16m 7s
	2h 36m 33s

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