patvar.lean:3:0-3:22: error: missing cases:
(List.cons _ _)
patvar.lean:10:0-10:16: error: missing cases:
(List.cons _ _)
patvar.lean:14:2-14:9: error: invalid pattern variable, must be atomic
patvar.lean:17:2-17:9: error: invalid pattern variable, must be atomic