Allow blocklisting anonymous enums #2725

Job	Run time
msrv	53s
docs	21s
check-cfg	21s
minimal	16s
quickchecking	13s
rustfmt-clippy	26s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 39s
test-book	8s
test-expectations (ubuntu-latest)	38s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 46s
test-no-headers	24s
test-expectations (macos-latest)	46s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 33s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 51s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 5s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 8s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 7s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 9s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	3m 59s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 0s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 52s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 39s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	5m 9s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 49s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 54s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 44s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 24s
test (macos-latest, 16.0, 0, 0, 0)	1m 55s
success	1s
	1h 0m 10s

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