{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"if"}]}
                if let ty::Adt(adt, _) = self.typeck_results().node_type(expr.hir_id).kind() {
                // mark the type of variant live when meeting E::V in expr
                    self.check_def_id(adt.did());