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Simon Peyton Jones authored
Trac #10516 pointed out that when reporting arity errors (like "T needs 2 arguments but has been given 1"), we should not count kind arguments, since they are implicit. If we include kind args in the count, we get very confusing error messages indeed. I did a little bit of refactoring which make some error messages wobble around. But the payload of this fix is in TcValidity.tyConArityErr
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