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So, the two lists ("reserved words", sec. 3.5, and "predeclared identifiers", sec. 4) are treated differently by the compiler:
MODULE PrivNil;
CONST TRUE = 0; NIL = 0;
END PrivNil.
It is allowed to redefine the predeclared identifiers, but not the reserved words.
Apparently, redefining NIL is far too dangerous -- would break the garbage collector,
whereas redefining ENTIER could be useful if the built-in routine has a bug,
and redefining INTEGER could be useful when porting ... etc.
Is it correct?
Cheers
Fyodor
> > The 1.4 compiler with service pack 1 gives an error for your code at the
> > place I have marked with [X]
> > MODULE PrivNil;
> >
> > CONST[X] NIL = 0;
> >
> > END PrivNil.
> >
> > The error message is "PROCEDURE, BEGIN, or END missing."
>
> Yes, exactly, Doug. this message proves that the next word "NIL" is not one
> of the keywords expected here, and so, that it is itself a keyword.
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Received on Sun Oct 17 2004 - 16:36:06 UTC