[gfortran] Fix NULL reference types.

Richard Kenner kenner@vlsi1.ultra.nyu.edu
Thu Aug 19 09:15:00 GMT 2004

    Kenner and I discussed this back in 1998:


I went back to that message.  You list four properties.  The latter two aren't
relevant for optimizers.  But the second is that it's never modified.
My feeling, though, is that REFERENCE_TYPE by itself shouldn't have that
property because we already have a way to represent something that's never

That means that only difference is that REFERENCE_TYPE values cannot be
null while POINTER_TYPE values can be.  Does that seem right?

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