Allow blocklisting anonymous enums #2724

Job	Run time
check-cfg	20s
minimal	10s
docs	16s
quickchecking	15s
rustfmt-clippy	25s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 34s
msrv	49s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 44s
test-book	19s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 38s
test-expectations (ubuntu-latest)	36s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 38s
test-no-headers	23s
test-expectations (macos-latest)	37s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 13s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 9s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 46s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 30s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	3m 58s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	4m 25s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	4m 3s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	4m 8s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	4m 59s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	4m 49s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 58s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 45s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 37s
test (macos-latest, 16.0, 0, 0, 0)	2m 5s
success	1s
	1h 1m 10s

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