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#![feature(generic_associated_types)]
trait Fun {
type F<'a>: ?Sized;
fn identity<'a>(t: &'a Self::F<'a>) -> &'a Self::F<'a> { t }
}
impl <T> Fun for T {
type F<'a> = i32;
}
fn bug<'a, T: ?Sized + Fun<F<'a> = [u8]>>(t: Box<T>) -> &'static T::F<'a> {
let a = [0; 1];
let x = T::identity(&a);
todo!()
}
fn main() {
let x = 10;
bug(Box::new(x));
//~^ ERROR: type mismatch resolving `<{integer} as Fun>::F<'_> == [u8]`
}
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