SI-8667 Caret at bad arg

Pick the first excessive positional arg for the caret.

Note that erroring on named args doesn't do the obvious thing
in this regard.

If `k` was removed from the signature, then `f(k=1, i=2, j=3)`
doesn't tell us much about the wrong arg, because naming takes
the `k=1` as an assignment, `i` as duplicate naming. No arg is
deemed extra, though further inspection of the conflicting args
might get there. Since assignment syntax in parens is more|less
deprecated (?), no more effort is done here.

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