test

`RuleBuilder#numberize_references` should check LHS and RHS for duplication #1057

Job	Run time
check-misc (head)	10s
steep-check (head)	14s
test-memory (head)	29s
test-ruby (head, master)	1m 3s
test-ruby (3.0, master)	1m 34s
test-windows (head)	2m 58s
test-ruby (2.5, master)	59s
ruby-versions / Generate Ruby versions	2s
test (2.5)	22s
test (2.6)	25s
test (2.7)	27s
test (3.0)	15s
test (3.1)	18s
test (3.2)	11s
test (3.3)	13s
test (head)	10s
	9m 50s

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