[m-rev.] for review: show existential quantifiers in type error messages

[Zoltan Somogyi]

On 06-Feb-2002, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Improve the error messages for type errors involving existentially quantified
> types.

The diff looks OK. However, it would be nice if you added a test case for
the "erroneous error" in which more than clause computes an existentially
typed argument.

Zoltan.
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