restructuring decomposition #239

Job	Run time
Bitrot check	1m 44s
Intra-doc links	59s
Build target wasm32-unknown-unknown	1m 19s
Book tests	1m 0s
Build target wasm32-wasi	1m 11s
Rustfmt	13s
Test on ubuntu-latest	6m 45s
Test on i686-unknown-linux-gnu	13m 10s
Test on windows-latest	9m 0s
Test on macOS-latest	12m 33s
Test on ubuntu-latest with beta features	6m 47s
Test on i686-unknown-linux-gnu with beta features	13m 16s
Test on windows-latest with beta features	9m 4s
Test on i686-unknown-linux-gnu with nightly features	14m 44s
Test on macOS-latest with beta features	14m 51s
Test on ubuntu-latest with nightly features	7m 53s
Test on windows-latest with nightly features	10m 14s
Test on macOS-latest with nightly features	8m 58s
	2h 13m 41s

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