Add Lookup generic argument in Lookup tests #510

Job	Run time
Bitrot check	1m 43s
Test on ubuntu-latest	9m 16s
Build target wasm32-unknown-unknown	2m 26s
Test on windows-latest	12m 59s
Build target wasm32-wasi	2m 18s
Book tests	2m 9s
Test on macOS-latest	8m 32s
Test on ubuntu-latest with beta features	9m 11s
Code coverage	2h 18m 30s
Test on windows-latest with beta features	13m 3s
Intra-doc links	2m 11s
Test on macOS-latest with beta features	7m 43s
Test on ubuntu-latest with nightly features	10m 2s
Rustfmt	15s
Test on windows-latest with nightly features	13m 48s
Test on i686-unknown-linux-gnu	17m 29s
Test on macOS-latest with nightly features	8m 8s
Test on i686-unknown-linux-gnu with beta features	17m 27s
Test on i686-unknown-linux-gnu with nightly features	18m 58s
	4h 56m 8s

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