[m-dev.] diff: warnings for wrong constructor arity

[Fergus Henderson]

David Glen JEFFERY, you wrote:
> 
> Can someone please review this?

That looks great, thanks.  I have only one very very minor suggestion:
I personally would write

			{ ActualArities \= [] }

rather than

> +			{ ActualArities = [_|_] }

-- 
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