{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"|mv_kind|"}]}
            |mv_kind| matches!(mv_kind, MetaVarKind::Pat(PatParam { .. })),
        if let Some(pat) = self.eat_metavar_seq_with_matcher(
            |this| this.parse_pat_no_top_alt(None, None),