Quieten `WouldBlock` errors #74

Job	Run time
Check for documentation errors	43s
Clippy	27s
Build+test (stable, ubuntu-latest)	1m 16s
Clang Tidy	10s
Build+test (beta, ubuntu-latest)	1m 26s
Clippy nightly (optional)	32s
Build+test (nightly, ubuntu-latest)	1m 24s
Format	18s
Miri	1m 1s
Valgrind	1m 56s
	9m 13s

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