{"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
        let output_ty = self.ret_ty(&method.output);
        let result = self.call_allocator(method.name, args);
        let decl = self.cx.fn_decl(abi_args, ast::FnRetTy::Ty(output_ty));