message: Fix 'variable does not need to be mutable' warnings
diff: @@ -69,7 +69,7 @@ impl UnwindRegistry {
  self.published = true;
  if !self.functions.is_empty() {
  - for (base_address, mut functions) in self.functions.iter_mut() {
  + for (base_address, functions) in self.functions.iter_mut() {
  // Windows heap allocations are 32-bit aligned, but assert just in case
  assert_eq!(
  (functions.as_mut_ptr() as u64) % 4,
  @@ -97,7 +97,7 @@ impl Drop for UnwindRegistry {
  fn drop(&mut self) {
  if self.published {
  unsafe {
  - for mut functions in self.functions.values_mut() {
  + for functions in self.functions.values_mut() {
  winnt::RtlDeleteFunctionTable(functions.as_mut_ptr());
  }
  }
  