Circuit changes draft #215

Job	Run time
Test on i686-unknown-linux-gnu	15m 57s
Build target wasm32-unknown-unknown	4m 3s
Test on i686-unknown-linux-gnu with beta features	15m 39s
Build target wasm32-wasi	3m 58s
Test on i686-unknown-linux-gnu with nightly features	17m 33s
Bitrot check	1m 31s
Book tests	3m 44s
Intra-doc links	4m 8s
Rustfmt	14s
Test on ubuntu-latest	9m 42s
Test on windows-latest	12m 17s
Test on macOS-latest	12m 41s
Test on ubuntu-latest with beta features	9m 35s
Test on windows-latest with beta features	12m 10s
Test on macOS-latest with beta features	11m 4s
Test on ubuntu-latest with nightly features	10m 46s
Test on windows-latest with nightly features	13m 46s
Test on macOS-latest with nightly features	13m 7s
	2h 51m 55s

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