message: Test that new interface also works on slices
diff: @@ -466,9 +466,9 @@ mod test {
  let mat =
  CsMatView::new_view(CSR, (5, 5), indptr, indices, data).unwrap();
  - let vector = vec![0.1, 0.2, -0.1, 0.3, 0.9];
  + let slice: &[f64] = &[0.1, 0.2, -0.1, 0.3, 0.9];
  let mut res_vec = vec![0., 0., 0., 0., 0.];
  - mul_acc_mat_vec_csr(mat, &vector, &mut res_vec);
  + mul_acc_mat_vec_csr(mat, slice, &mut res_vec);
  let expected_output =
  vec![0.22527496, 0., 0.17814121, 0.35319787, 0.51482166];
  