src/tools/clippy/mini-macro/src/lib.rs

#![feature(proc_macro_quote, proc_macro_hygiene)]
#![deny(rust_2018_idioms)]
extern crate proc_macro;

use proc_macro::{TokenStream, quote};

#[proc_macro_derive(ClippyMiniMacroTest)]
pub fn mini_macro(_: TokenStream) -> TokenStream {
    quote!(
        #[allow(unused)] fn needless_take_by_value(s: String) { println!("{}", s.len()); }
        #[allow(unused)] fn needless_loop(items: &[u8]) {
            for i in 0..items.len() {
                println!("{}", items[i]);
            }
        }
    )
}