src/test/run-pass-fulldeps/proc-macro/auxiliary/issue-39889.rs

   1 // Copyright 2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // force-host
  12 // no-prefer-dynamic
  13
  14 #![crate_type = "proc-macro"]
  15
  16 extern crate proc_macro;
  17 use proc_macro::TokenStream;
  18
  19 #[proc_macro_derive(Issue39889)]
  20 pub fn f(_input: TokenStream) -> TokenStream {
  21     let rules = r#"
  22         macro_rules! id {
  23             ($($tt:tt)*) => { $($tt)* };
  24         }
  25     "#;
  26     rules.parse().unwrap()
  27 }