Allow blocklisting anonymous enums #2723

Job	Run time
docs	19s
minimal	10s
check-cfg	20s
quickchecking	12s
rustfmt-clippy	12s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 49s
msrv	48s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 37s
test-book	21s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 43s
test-expectations (ubuntu-latest)	41s
test-no-headers	25s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 40s
test-expectations (macos-latest)	38s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 21s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 1s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 5s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 16s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	3m 58s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	3m 59s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	3m 48s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	3m 58s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	5m 6s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	5m 22s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	4m 52s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	4m 41s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 25s
test (macos-latest, 16.0, 0, 0, 0)	1m 50s
success	1s
	59m 38s

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