upstream update #541

Job	Run time
Build target wasm32-unknown-unknown	2m 15s
Book tests	1m 43s
Bitrot check	1m 36s
Build target wasm32-wasi	2m 0s
Intra-doc links	1m 54s
Test on ubuntu-latest	10m 58s
Test on windows-latest	15m 42s
Code coverage	3h 4m 42s
Test on macOS-latest	8m 49s
Test on i686-unknown-linux-gnu	22m 57s
Test on ubuntu-latest with beta features	11m 7s
Rustfmt	18s
Test on windows-latest with beta features	14m 30s
Test on macOS-latest with beta features	10m 35s
Test on i686-unknown-linux-gnu with beta features	22m 54s
Test on ubuntu-latest with nightly features	11m 4s
Test on i686-unknown-linux-gnu with nightly features	23m 7s
Test on windows-latest with nightly features	15m 11s
Test on macOS-latest with nightly features	11m 55s
	6h 13m 17s

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