| // Copyright 2020 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // This differs from the edition 2015 version because it does not have an `extern proc_macro` |
| // statement, which became optional in edition 2018. |
| |
| use proc_macro::TokenStream; |
| |
| /// This macro is a no-op; it is exceedingly simple as a result |
| /// of avoiding dependencies on both the syn and quote crates. |
| #[proc_macro_derive(HelloWorld)] |
| pub fn hello_world(_input: TokenStream) -> TokenStream { |
| TokenStream::new() |
| } |
