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Properly guard against incomplete Rails module definitions #8537

Job	Run time
benchmark	1m 33s
test (Rails 8.0, Ruby 3.4)	41s
test (Rails 7.1, Ruby 3.2)	39s
test (Rails 8.1, Ruby 3.4)	29s
Test compatibility with Primer ViewComponents (main)	19m 39s
test (Rails 7.2, Ruby 3.3)	35s
test (Rails main, Ruby head)	35s
coverage	12s
	24m 23s