File: expand-with-a-macro.rs

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#![deny(warnings)]

extern crate proc_macro;

use proc_macro::TokenStream;

#[proc_macro_derive(A)]
pub fn derive(input: TokenStream) -> TokenStream {
    let input = input.to_string();
    assert!(input.contains("struct A;"));
    r#"
        impl A {
            fn a(&self) {
                panic!("hello");
            }
        }
    "#.parse().unwrap()
}