{"ast_node_type":"variable","tokens":[{"end":74,"kind":"keyword","start":0,"text":"let"}]}
        let decl = self.cx.fn_decl(abi_args, ast::FnRetTy::Ty(output_ty));
        let output_ty = self.ret_ty(&method.output);
        let header = FnHeader { safety: Safety::Unsafe(self.span), ..FnHeader::default() };