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Properly guard against incomplete Rails module definitions #8342

Job	Run time
benchmark	1m 33s
test (Rails 8.0, Ruby 3.4)	29s
test (Rails main, Ruby head)	15s
Test compatibility with Primer ViewComponents (main)	18m 43s
test (Rails 7.1, Ruby 3.2)	31s
test (Rails 7.2, Ruby 3.3)	34s
coverage	0s
	22m 5s