Continuous integration

Implement `Error.isError` #12689

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Run time

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Job	Run time
Coverage	10m 39s
MSRV	1m 59s
Test (macos-latest)	2m 18s
Fuzzing	1m 9s
Test (windows-latest)	2m 17s
Lint	1m 12s
Build & run examples	1m 38s
Documentation	1m 31s
Formatting	6s
	22m 49s