Save test files for optimized lookup range check #466

Job	Run time
Bitrot check	1m 40s
Book tests	1m 48s
Build target wasm32-unknown-unknown	2m 20s
Build target wasm32-wasi	2m 7s
Intra-doc links	1m 53s
Rustfmt	16s
Test on ubuntu-latest	11m 15s
Test on windows-latest	14m 37s
Test on i686-unknown-linux-gnu	23m 34s
Test on macOS-latest	10m 50s
Test on i686-unknown-linux-gnu with beta features	22m 48s
Test on ubuntu-latest with beta features	11m 27s
Test on i686-unknown-linux-gnu with nightly features	24m 6s
Test on windows-latest with beta features	14m 45s
Test on macOS-latest with beta features	8m 50s
Test on ubuntu-latest with nightly features	11m 15s
Test on windows-latest with nightly features	15m 21s
Test on macOS-latest with nightly features	14m 11s
	3h 13m 3s

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