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Properly guard against incomplete Rails module definitions #8536

Job	Run time
benchmark	1m 32s
Test compatibility with Primer ViewComponents (main)	19m 52s
test (Rails 8.1, Ruby 3.4)	36s
test (Rails 8.0, Ruby 3.4)	57s
test (Rails main, Ruby head)	34s
test (Rails 7.1, Ruby 3.2)	32s
test (Rails 7.2, Ruby 3.3)	38s
coverage	12s
	24m 53s