src/test/ui/auto-traits/issue-23080.rs

#![feature(optin_builtin_traits)]
#![feature(negative_impls)]

unsafe auto trait Trait {
    fn method(&self) { //~ ERROR E0380
        println!("Hello");
    }
}

fn call_method<T: Trait>(x: T) {
    x.method();
}

fn main() {
    // ICE
    call_method(());
}