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7453a54e | 1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
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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 | ||
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11 | // no-prefer-dynamic |
12 | ||
c30ab7b3 | 13 | #![crate_type = "proc-macro"] |
1a4d82fc | 14 | |
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15 | extern crate proc_macro; |
16 | ||
17 | use proc_macro::TokenStream; | |
18 | ||
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19 | // Outputs another copy of the struct. Useful for testing the tokens |
20 | // seen by the proc_macro. | |
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21 | #[proc_macro_derive(Double)] |
22 | pub fn derive(input: TokenStream) -> TokenStream { | |
23 | format!("mod foo {{ {} }}", input.to_string()).parse().unwrap() | |
223e47cc | 24 | } |