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#![feature(const_trait_impl)]

// 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]`

const fn foo<T: Bar>(x: &T) {
    x.a();
    //[yn,yy]~^ ERROR the trait bound
}

fn main() {}