Macro arrutil::split_to_array

macro_rules! split_to_array {
    ($source:expr, $len:expr) => { ... };
}

You can use split_to_array to turn a slice into a reference to an array and a slice starting from the end of the array.

Internally, it has the signature

fn split_to_array<T>(source: &[T]) -> Option<(&[T; N], &[T])>

Externally, it should be seen as having the signature

slice_to_array!(source: &[T], len: N) -> Option<(&[T; N], &[T])>

Where N is an integer literal and a valid array length.

Returns None when length is longer than slice.