4 #![crate_type = "proc-macro"]
6 extern crate proc_macro;
8 use proc_macro::TokenStream;
11 pub fn rewrite(input: TokenStream) -> TokenStream {
12 let input = input.to_string();
14 assert_eq!(input, r#""Hello, world!""#);
16 r#""NOT Hello, world!""#.parse().unwrap()