as: Bug Criteria

 
 10.1 Have You Found a Bug?
 ==========================
 
 If you are not sure whether you have found a bug, here are some
 guidelines:
 
    * If the assembler gets a fatal signal, for any input whatever, that
      is a 'as' bug.  Reliable assemblers never crash.
 
    * If 'as' produces an error message for valid input, that is a bug.
 
    * If 'as' does not produce an error message for invalid input, that
      is a bug.  However, you should note that your idea of "invalid
      input" might be our idea of "an extension" or "support for
      traditional practice".
 
    * If you are an experienced user of assemblers, your suggestions for
      improvement of 'as' are welcome in any case.