Function flatten 

pub fn flatten(
    matrix: AbstractLiteral<Literal>,
) -> impl Iterator<Item = Literal>

Flattens a multi-dimensional matrix literal into a one-dimensional slice of its elements.

The elements of the matrix are returned in row-major ordering (see enumerate_indices).

Panics

• If the number or type of elements in each dimension is inconsistent.

• If matrix is not a matrix.