Circuit changes draft #221

Job	Run time
Test on ubuntu-latest	9m 39s
Bitrot check	1m 29s
Test on windows-latest	12m 27s
Test on macOS-latest	13m 48s
Book tests	3m 48s
Test on ubuntu-latest with beta features	9m 53s
Test on windows-latest with beta features	12m 35s
Build target wasm32-unknown-unknown	4m 10s
Test on macOS-latest with beta features	11m 41s
Build target wasm32-wasi	4m 7s
Test on ubuntu-latest with nightly features	10m 42s
Test on windows-latest with nightly features	13m 31s
Test on macOS-latest with nightly features	11m 44s
Intra-doc links	3m 48s
Rustfmt	13s
Test on i686-unknown-linux-gnu	16m 19s
Test on i686-unknown-linux-gnu with beta features	16m 10s
Test on i686-unknown-linux-gnu with nightly features	18m 16s
	2h 54m 20s

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