{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"Ty::new_tup_from_iter(self.tcx,"}]}
                Ty::new_tup_from_iter(self.tcx, arg_exprs.iter().map(|e| self.next_ty_var(e.span)))
            let opt_input_type = opt_arg_exprs.map(|arg_exprs| {
            });