Merge pull request #1057 from xxchan/xxchan/scattered-perch #1158

Job	Run time
Checking fmt and docs	53s
Check io_safety feature (ubuntu-latest)	15s
Check io_safety feature (windows-latest)	1m 49s
Build and test (ubuntu-latest, nightly)	39s
Build and test (ubuntu-latest, beta)	40s
Build and test (ubuntu-latest, stable)	36s
Build and test (windows-latest, nightly)	39s
Build and test (windows-latest, beta)	39s
Build and test (windows-latest, stable)	40s
Build and test (macOS-latest, nightly)	37s
Build and test (macOS-latest, beta)	36s
Build and test (macOS-latest, stable)	34s
Build with no-std	17s
Check tokio02 feature	22s
Check wasm targets (nightly)	39s
Check wasm targets (beta)	43s
Check wasm targets (stable)	43s
Cross compile (i686-unknown-linux-gnu)	2m 9s
Cross compile (powerpc-unknown-linux-gnu)	1m 55s
Cross compile (mips-unknown-linux-gnu)	2m 19s
Cross compile (arm-linux-androideabi)	2m 11s
	19m 55s

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