Refactor #512

Job	Run time
Bitrot check	1m 33s
Build target wasm32-unknown-unknown	2m 28s
Test on i686-unknown-linux-gnu	21m 40s
Build target wasm32-wasi	2m 25s
Book tests	2m 7s
Test on i686-unknown-linux-gnu with beta features	21m 45s
Code coverage	2h 59m 52s
Test on i686-unknown-linux-gnu with nightly features	21m 18s
Intra-doc links	2m 9s
Rustfmt	13s
Test on ubuntu-latest	10m 46s
Test on windows-latest	14m 51s
Test on macOS-latest	8m 19s
Test on ubuntu-latest with beta features	10m 47s
Test on windows-latest with beta features	15m 4s
Test on macOS-latest with beta features	9m 5s
Test on ubuntu-latest with nightly features	10m 53s
Test on windows-latest with nightly features	14m 39s
Test on macOS-latest with nightly features	10m 30s
	6h 0m 24s

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