`.set SYMBOL, EXPRESSION'
=========================

   This directive sets the value of SYMBOL to EXPRESSION.  This will
change SYMBOL's value and type to conform to EXPRESSION.  If SYMBOL was
flagged as external, it remains flagged. (See Symbol Attributes.)

   You may `.set' a symbol many times in the same assembly.  If the
expression's section is unknowable during pass 1, a second pass over
the source program will be forced.  The second pass is currently not
implemented.  `as' will abort with an error message if one is required.

   If you `.set' a global symbol, the value stored in the object file
is the last value stored into it.