Interface ValidMask

aiscript-arena/src/types.rs:280–282

    use core::cell::Cell;

    trait ValidMask<const MASK: usize> {
        const CHECK: ();
    }

    impl<T, const MASK: usize> ValidMask<MASK> for T {
        const CHECK: () = assert!(MASK < core::mem::align_of::<T>());