Macro array_buf 

macro_rules! array_buf {
    ($t:ty; $n:ident) => { ... };
}

Shorthand for defining a array buffer

The array size must be a typenum unsigned integer (e.g U8) E.g. array_buf![u8; U32] expands to ::stack_dst::buffers::ArrayBuf<u8, ::stack_dst::buffers::n::::U32>