rust/tests/ui/rfcs/rfc-2632-const-trait-impl/super-traits-fail-2.rs

#![feature(const_trait_impl, effects)]
// revisions: yy yn ny nn

#[cfg_attr(any(yy, yn), const_trait)]
trait Foo {
    fn a(&self);
}

#[cfg_attr(any(yy, ny), const_trait)]
trait Bar: ~const Foo {}
//[ny,nn]~^ ERROR: ~const can only be applied to `#[const_trait]`
//[ny,nn]~| ERROR: ~const can only be applied to `#[const_trait]`
//[yn,nn]~^^^ ERROR: `~const` is not allowed here

const fn foo<T: Bar>(x: &T) {
    x.a();
    //[yy,yn]~^ ERROR mismatched types
    // FIXME(effects) diagnostic
}

fn main() {}