Merge pull request #846 from zcash/bugfix #4115

Job	Run time
Build target wasm32-wasi	3m 53s
Build target wasm32-unknown-unknown	3m 55s
Test on i686-unknown-linux-gnu	18m 16s
Test on i686-unknown-linux-gnu with nightly features	20m 37s
Book tests	3m 39s
Test on i686-unknown-linux-gnu with beta features	18m 38s
Test on ubuntu-latest	10m 37s
Test on ubuntu-latest with beta features	10m 43s
Test on macOS-latest	10m 26s
Test on macOS-latest with beta features	9m 54s
Test on ubuntu-latest with nightly features	11m 17s
Test on windows-latest with beta features	14m 0s
Code coverage	2h 29m 2s
Rustfmt	13s
Intra-doc links	3m 39s
Test on windows-latest with nightly features	14m 36s
Test on macOS-latest with nightly features	11m 0s
Bitrot check	10s
Test on windows-latest	14m 26s
	5h 29m 1s

Provide feedback