Merge branch 'sync_from_rust' #2889

Job	Run time
rustfmt	19s
bench	13m 16s
dist (ubuntu-20.04, x86_64-unknown-linux-gnu)	2m 18s
dist (macos-latest, x86_64-apple-darwin)	3m 36s
dist (ubuntu-latest, x86_64-pc-windows-gnu)	4m 38s
dist (windows-latest, x86_64-pc-windows-msvc)	3m 56s
dist (windows-latest, x86_64-pc-windows-gnu)	4m 22s
test_llvm	6m 21s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	11m 47s
test (macos-latest, x86_64-apple-darwin)	18m 1s
test (ubuntu-latest, x86_64-pc-windows-gnu)	11m 31s
test (ubuntu-latest, aarch64-unknown-linux-gnu)	6m 9s
test (ubuntu-latest, s390x-unknown-linux-gnu)	7m 36s
test (windows-latest, x86_64-pc-windows-msvc)	19m 35s
test (windows-latest, x86_64-pc-windows-gnu)	23m 16s
release	47s
	2h 17m 28s

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