[m-rev.] diff: fix misleading mode error

[Zoltan Somogyi]

On 01-Aug-2001, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> compiler/modecheck_unify.m:
> 	Fix a couple of bugs where we were setting the call context before
> 	mode-checking some sub-goal, and then forgetting to unset it
> 	afterwards.  This resulted in the compiler issuing some misleading
> 	error messages.

Is there a test case for this diff?

Zoltan.
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