Circuit changes draft #240

Job	Run time
Bitrot check	1m 35s
Book tests	56s
Build target wasm32-unknown-unknown	1m 24s
Intra-doc links	59s
Build target wasm32-wasi	1m 11s
Rustfmt	12s
Test on ubuntu-latest	6m 57s
Test on i686-unknown-linux-gnu	12m 59s
Test on windows-latest	9m 39s
Test on i686-unknown-linux-gnu with beta features	12m 58s
Test on macOS-latest	7m 16s
Test on i686-unknown-linux-gnu with nightly features	15m 36s
Test on ubuntu-latest with beta features	6m 39s
Test on windows-latest with beta features	9m 13s
Test on macOS-latest with beta features	7m 48s
Test on ubuntu-latest with nightly features	7m 44s
Test on windows-latest with nightly features	10m 59s
Test on macOS-latest with nightly features	6m 50s
	2h 0m 55s

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