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Properly guard against incomplete Rails module definitions #8535

Job	Run time
benchmark	1m 35s
Test compatibility with Primer ViewComponents (main)	19m 21s
test (Rails 7.2, Ruby 3.3)	44s
test (Rails 7.1, Ruby 3.2)	38s
test (Rails 8.0, Ruby 3.4)	31s
test (Rails main, Ruby head)	36s
test (Rails 8.1, Ruby 3.4)	34s
coverage	11s
	24m 10s