{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"Some(self.typeck_results.borrow().node_args(expr.hir_id).type_at(1))"}]}
                Some(self.typeck_results.borrow().node_args(expr.hir_id).type_at(1))
                // which can potentially cause regionck failure (#74933).
            }