SI-5091 Move named-args cycle test from pending to neg

There is a typechecking cycle, and since 4669ac180e5 we now report
this in a clearer manner.

Once we change the language to unconditionally interpret an
assignent in argument position as a named argument would be the
only way to get this over to `pos`.
SI-6051 Test case, the issue seems to be fixed.
Merge pull request #7 from lrytz/t6051

SI-6051 Test case, the issue seems to be fixed.
Merge pull request #4044 from retronym/ticket/5091

SI-5091 Move named-args cycle test from pending to neg