[m-rev.] for review: diffs for arg type lists

[Zoltan Somogyi]

On Wed, 02 Jan 2019 21:16:45 +1100 (AEDT), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> > This test should be more comprehensive, for example if the declaration or
> > clause has arity 0, if there is more than one difference between the lists,
> > where the declaration involved is a function etc.
> 
> Will do.

Just as well you asked for that. The extensions to both test cases detected bugs,
which the attached committed diff fixes.

You may wish to have a look at both test cases to see if they meet with your
approval in their current form.

Zoltan.
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