message: Fixed unnecessary clone
  Closes
diff: @@ -1115,7 +1115,7 @@ impl Runtime {
  let new_index = (f_index + relative as isize) as usize;
  // Copy the module to avoid problems with borrow checker.
  let mod_copy = self.module.clone();
  - let ref f = mod_copy.functions[new_index].clone();
  + let ref f = mod_copy.functions[new_index];
  if call.arg_len() != f.args.len() {
  return Err(self.module.error(call.source_range,
  &format!("{}\nExpected {} arguments but found {}",
  