1 #![feature(tool_lints)]
3 #![crate_type = "proc-macro"]
4 #![warn(clippy::needless_pass_by_value)]
6 extern crate proc_macro;
8 use proc_macro::TokenStream;
10 #[proc_macro_derive(Foo)]
11 pub fn foo(_input: TokenStream) -> TokenStream { unimplemented!() }