[m-rev.] diff: fix typechecker abort

[Fergus Henderson]

On 22-Feb-2003, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> 
> compiler/typecheck.m:
> 	Fix a bug which caused an abort on unifications of the form
> 	`X = X', where `X' hadn't been seen before in the goal.

Thanks Simon. 
I was just about to squash that one myself, but you beat me to it!

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.
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