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RE: [Gm2] equality, inequality tests and structured types

From: Breeden, Thomas (tmb)
Subject: RE: [Gm2] equality, inequality tests and structured types
Date: Wed, 28 Jan 2009 16:56:53 -0500

> -----Original Message-----
> From: Andreas Fischlin [mailto:address@hidden
> We need to keep these issues separate, i.e. equality and inequality
> tests and coercability between pointers (ADDRESS) and variables of an
> opaque type. Therefore:
> ...
>      IF x1 <> x2 THEN
> has not necessary anything to do with assignment compatibility. A
> construct like
>           undefMyOpaque: MyOpaque; (read-only)
> can serve to overcome this NIL incompatibility 

Ah yes. I have gotten so unaccustomed to putting variables in the Definition 
I have been doing this with a function call like IOChan.InvalidChan() to be 


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