rust/tests/ui/rfcs/rfc-2632-const-trait-impl/do-not-const-check-override.rs

//@ check-pass
#![feature(const_trait_impl, rustc_attrs, effects)] //~ WARN the feature `effects` is incomplete

#[const_trait]
trait Foo {
    #[rustc_do_not_const_check]
    fn into_iter(&self) { println!("FEAR ME!") }
}


impl const Foo for () {
    fn into_iter(&self) {
        // ^_^
    }
}

const _: () = Foo::into_iter(&());

fn main() {}