src/test/ui/feature-gates/feature-gate-const-indexing.rs

// compile-pass

fn main() {
    const ARR: [i32; 6] = [42, 43, 44, 45, 46, 47];
    const IDX: usize = 3;
    const VAL: i32 = ARR[IDX];
    const BLUB: [i32; (ARR[0] - 41) as usize] = [5];
}