message: Allow unused loop label in sprs-ldl
  This would fail the denial of warnings in CI, but this label is used in
  important comments, so I'd rather keep it.
diff: @@ -514,6 +514,7 @@ where
  // of the kth row of L
  diag[k] = y_workspace[k];
  y_workspace[k] = N::zero();
  + #[allow(unused_labels)]
  'pattern: for &i in pattern_workspace.iter_right() {
  let i = i.index_unchecked();
  let yi = y_workspace[i];
  