Ruby

Support RBS::AST::Members::ClassVariable #1139

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (3.4)	46s
build (3.3)	47s
build (3.2)	42s
build (truffleruby)	33s
build (truffleruby-head)	31s
build (head)	42s
	4m 4s

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