// run-pass #![feature(generic_const_exprs)] #![allow(incomplete_features)] trait MyTrait { type ArrayType; const SIZE: usize; const ARRAY: Self::ArrayType; } impl MyTrait for () { type ArrayType = [u8; Self::SIZE]; const SIZE: usize = 4; const ARRAY: [u8; Self::SIZE] = [1, 2, 3, 4]; } fn main() { let _ = <() as MyTrait>::ARRAY; }