message: Removing usage of step_by
diff: @@ -322,8 +322,10 @@ mod tests {
  b.iter(|| {
  let n = test::black_box(7000u32);
  let mut a = 0u64;
  - for i in (0u32..n).step_by(7) {
  + let mut i = 0u32;
  + while i < n {
  a ^= permutation[i as usize];
  + i += 7;
  }
  a
  });
  @@ -365,8 +367,10 @@ mod tests {
  b.iter(|| {
  let n = test::black_box(7000u32);
  let mut a = 0u64;
  - for i in (0u32..n).step_by(7) {
  + let mut i = 0u32;
  + while i < n {
  a ^= fast_field_reader.get(i);
  + i += 7;
  }
  a
  });
  