rust/tests/ui/const-generics/generic_const_exprs/nested_uneval_unification-2.rs
2024-02-16 20:02:50 +00:00

32 lines
756 B
Rust

//@ 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``
// FIXME(generic_const_exprs): come up with a less brittle test for this using assoc consts
// once normalization is implemented for them.