Circuit changes draft #211

Job	Run time
Build target wasm32-unknown-unknown	3m 57s
Bitrot check	1m 28s
Build target wasm32-wasi	3m 54s
Test on i686-unknown-linux-gnu	15m 32s
Test on ubuntu-latest	9m 23s
Test on i686-unknown-linux-gnu with beta features	15m 48s
Test on windows-latest	12m 19s
Test on macOS-latest	10m 24s
Test on i686-unknown-linux-gnu with nightly features	17m 47s
Book tests	3m 38s
Test on ubuntu-latest with beta features	9m 22s
Test on windows-latest with beta features	11m 58s
Intra-doc links	3m 35s
Rustfmt	14s
Test on macOS-latest with beta features	10m 11s
Test on ubuntu-latest with nightly features	10m 22s
Test on windows-latest with nightly features	13m 15s
Test on macOS-latest with nightly features	10m 56s
	2h 44m 3s

Provide feedback