Merge pull request #823 from QED-it/improve-backward-compatability-wi… #4098

Job	Run time
Test on i686-unknown-linux-gnu	19m 21s
Code coverage	2h 24m 20s
Test on i686-unknown-linux-gnu with nightly features	20m 59s
Test on i686-unknown-linux-gnu with beta features	18m 33s
Test on windows-latest	13m 30s
Build target wasm32-wasi	4m 12s
Test on macOS-latest	9m 44s
Test on ubuntu-latest	10m 52s
Build target wasm32-unknown-unknown	3m 54s
Test on windows-latest with beta features	13m 48s
Test on windows-latest with nightly features	14m 36s
Rustfmt	17s
Test on macOS-latest with nightly features	10m 35s
Test on ubuntu-latest with beta features	11m 49s
Bitrot check	1m 30s
Test on macOS-latest with beta features	12m 1s
Book tests	3m 45s
Intra-doc links	3m 31s
Test on ubuntu-latest with nightly features	12m 23s
	5h 29m 40s

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