tests/ui/const-generics/generic_const_exprs/nested_uneval_unification-2.rs

// run-pass
#![feature(generic_const_exprs)]
#![allow(incomplete_features, unused_parens, unused_braces)]

fn zero_init<const N: usize>() -> Substs1<{ (N) }>
where
    [u8; { (N) }]: ,
{
    Substs1([0; { (N) }])
}

struct Substs1<const N: usize>([u8; { (N) }])
where
    [(); { (N) }]: ;

fn substs2<const M: usize>() -> Substs1<{ (M) }> {
    zero_init::<{ (M) }>()
}

fn substs3<const L: usize>() -> Substs1<{ (L) }> {
    substs2::<{ (L) }>()
}

fn main() {
    assert_eq!(substs3::<2>().0, [0; 2]);
}

// Test that the implicit ``{ (L) }`` bound on ``substs3`` satisfies the
// ``{ (N) }`` bound on ``Substs1``