support `b path: path_expr` #1782

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (2.7)	2m 19s
test (3.3)	1m 58s
test (3.1)	1m 58s
test (3.0)	2m 0s
test (debug)	6m 13s
test (3.4)	1m 58s
test (head)	1m 57s
test (3.2)	1m 56s
	20m 24s

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