rust/src/test/ui/proc-macro/trait-fn-args-2015.rs

// Unnamed arguments in trait functions can be passed through proc macros on 2015 edition.

// check-pass
// aux-build:test-macros.rs

#[macro_use]
extern crate test_macros;

trait Tr {
    #[identity_attr]
    fn method(u8);
}

fn main() {}