[m-rev.] for review: fix contravariance mode bug

[Fergus Henderson]

On 28-Jul-2003, David Overton <dmo at cs.mu.OZ.AU> wrote:
> compiler/inst_match.m:
> 	Fix a bug which was causing the mode system to be
> 	overly-conservative: pred_inst_matches was requiring initial
> 	insts of higher-order arguments to match invariantly rather than
> 	contravariantly. [...]

That looks good, thanks.

-- 
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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