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.