code: @Deprecated // use add_new_parameter()
    protected final LocalVariableGen add_new_argument(
        MethodGen mgen, String arg_name, Type arg_type) {
      return add_new_parameter(mgen, arg_name, arg_type);
    }
docs: Add a new parameter to the method. This will be added after last current parameter and before
  the first local variable. This might have the side effect of causing us to rewrite the method
  byte codes to adjust the offsets for the local variables - see below for details.
  
  <p>Must call fix_local_variable_table (just once per method) before calling this routine.
  
  @param mgen MethodGen to be modified
  @param arg_name name of new parameter
  @param arg_type type of new parameter
  @return a LocalVariableGen for the new parameter
  @deprecated use {@link #add_new_parameter}