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    /// Trait for fixed size arrays.
    ///
    /// This trait is implemented for some specific array sizes, see
    /// the implementor list below. At the current state of Rust we can't
    /// make this fully general for every array size.
    ///
    /// The following crate features add more array sizes (and they are not
    /// enabled by default due to their impact on compliation speed).
    ///
    /// - `array-sizes-33-128`: All sizes 33 to 128 are implemented
    ///   (a few in this range are included by default).
    /// - `array-sizes-129-255`: All sizes 129 to 255 are implemented
    ///   (a few in this range are included by default).
    pub unsafe trait Array {
        /// The array’s element type
        type Item;
        #[doc(hidden)]
        /// The smallest index type that indexes the array.
        type Index: Index;
        #[doc(hidden)]
        fn as_ptr(&self) -> *const Self::Item;
        #[doc(hidden)]
        fn as_mut_ptr(&mut self) -> *mut Self::Item;
        #[doc(hidden)]
        fn capacity() -> usize;
    }

    pub trait Index : PartialEq + Copy {
        fn to_usize(self) -> usize;
        fn from(usize) -> Self;
    }

    use std::slice::{from_raw_parts};

    pub trait ArrayExt : Array {
        #[inline(always)]
        fn as_slice(&self) -> &[Self::Item] {
            unsafe {
                from_raw_parts(self.as_ptr(), Self::capacity())
            }
        }
    }

    impl<A> ArrayExt for A where A: Array { }

    impl Index for u8 {
        #[inline(always)]
        fn to_usize(self) -> usize { self as usize }
        #[inline(always)]
        fn from(ix: usize) ->  Self { ix as u8 }
    }

    impl Index for u16 {
        #[inline(always)]
        fn to_usize(self) -> usize { self as usize }
        #[inline(always)]
        fn from(ix: usize) ->  Self { ix as u16 }
    }

    impl Index for u32 {
        #[inline(always)]
        fn to_usize(self) -> usize { self as usize }
        #[inline(always)]
        fn from(ix: usize) ->  Self { ix as u32 }
    }

    impl Index for usize {
        #[inline(always)]
        fn to_usize(self) -> usize { self }
        #[inline(always)]
        fn from(ix: usize) ->  Self { ix }
    }

    macro_rules! fix_array_impl {
        ($index_type:ty, $len:expr ) => (
            unsafe impl<T> Array for [T; $len] {
                type Item = T;
                type Index = $index_type;
                #[doc(hidden)]
                #[inline(always)]
                fn as_ptr(&self) -> *const T { self as *const _ as *const _ }
                #[doc(hidden)]
                #[inline(always)]
                fn as_mut_ptr(&mut self) -> *mut T { self as *mut _ as *mut _}
                #[doc(hidden)]
                #[inline(always)]
                fn capacity() -> usize { $len }
            }
        )
    }

    macro_rules! fix_array_impl_recursive {
        ($index_type:ty, ) => ();
        ($index_type:ty, $($len:expr,)*) => (
            $(fix_array_impl!($index_type, $len);)*
        );
    }

    fix_array_impl_recursive!(u8, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
                              15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
                              28, 29, 30, 31, );

    #[cfg(not(feature="array-sizes-33-128"))]
    fix_array_impl_recursive!(u8, 32, 40, 48, 50, 56, 64, 72, 96, 100, 128, );

    #[cfg(feature="array-sizes-33-128")]
    fix_array_impl_recursive!(u8,
    32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
    72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
    92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108,
    109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124,
    125, 126, 127, 128,
    );

    #[cfg(not(feature="array-sizes-129-255"))]
    fix_array_impl_recursive!(u8, 160, 192, 200, 224,);

    #[cfg(feature="array-sizes-129-255")]
    fix_array_impl_recursive!(u8,
    129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140,
    141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156,
    157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172,
    173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188,
    189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204,
    205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220,
    221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236,
    237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252,
    253, 254, 255,
    );

    fix_array_impl_recursive!(u16, 256, 384, 512, 768, 1024, 2048, 4096, 8192, 16384, 32768,);
    // This array size doesn't exist on 16-bit
    #[cfg(any(target_pointer_width="32", target_pointer_width="64"))]
    fix_array_impl_recursive!(u32, 1 << 16,);

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