Traits with compile-time SIMD size

trait PRNGEngine(Movable):
    @staticmethod
    fn ndim() -> Int:
        """SIMD size."""
        pass

    fn next_scalar(inout self) -> UInt64:
        """Get only a single value from the generator."""
        pass

    fn next(inout self) -> SIMD[DType.uint64, Self.ndim()]:
        """Get Self.ndim() values from the generator."""
        pass


struct DummyEngine[n: Int](PRNGEngine):
    @staticmethod
    fn ndim() -> Int:
        """SIMD size."""
        return 2

    fn next_scalar(inout self) -> UInt64:
        """Get only a single value from the generator."""
        return 42

    fn next(inout self) -> SIMD[DType.uint64, Self.ndim()]:
        """Get Self.ndim() values from the generator."""
        var res: SIMD[DType.uint64, Self.ndim()] = 42
        return res