| // force-host | |
| // no-prefer-dynamic | |
| #![crate_type = "proc-macro"] | |
| extern crate proc_macro; | |
| use proc_macro::TokenStream; | |
| // Outputs another copy of the struct. Useful for testing the tokens | |
| // seen by the proc_macro. | |
| #[proc_macro_derive(Double)] | |
| pub fn derive(input: TokenStream) -> TokenStream { | |
| format!("mod foo {{ {} }}", input.to_string()).parse().unwrap() | |
| } |