Is there a trait applicable for multi-dimensional indexing?

Hi all.

Does anyone know if there is a trait that would be applicable to multi-dimensional indexing, such as this: x[y][z].

The closest I've found is something like this, which seems is syntactically less efficient:

impl Index<(usize, usize)> for Matrix {
    type Output = f32;

    fn index(&self, index: (usize, usize)) -> &Self::Output {
        assert!(index.0 < self.row_count() && index.1 < self.column_count());

        &self.m[index.0][index.1]
    }
}

Which can be accessed like this: matrix[(i, j)]. As I said, the syntax seems less efficient than purely matrix[i][j].

Any ideas?