fn main() {
    #[cfg(all(target_endian="little", target_pointer_width="64"))]
    let bad = unsafe {
        std::mem::transmute::<u128, &[u8]>(42)
    };
    #[cfg(all(target_endian="big", target_pointer_width="64"))]
    let bad = unsafe {
        std::mem::transmute::<u128, &[u8]>(42 << 64)
    };
    #[cfg(all(target_endian="little", target_pointer_width="32"))]
    let bad = unsafe {
        std::mem::transmute::<u64, &[u8]>(42)
    };
    // This created a slice with length 0, so the following will fail the bounds check.
    bad[0];
}