+ CALLBACK callback_rval[func] LPAREN impl_var[var] LPAREN callback_arg_list[args] RPAREN RPAREN {
+ $callback = psi_let_callback_init(psi_let_func_init($func->type, $func->text, $var), $args, NULL);
+ $callback->func->token = psi_token_copy($func);
+ $callback->token = psi_token_copy($CALLBACK);
+}
+| CALLBACK LPAREN call_decl_vars[cb_args] RPAREN AS callback_rval[func] LPAREN impl_var[var] LPAREN callback_arg_list[args] RPAREN RPAREN {