Fix bad error message #234
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When in a language with flexible polymorphism (i.e. type arguments can be omitted, or can be specified), the error message for bad arity of a function application was producing a bad error message when the function being applied was not polymorphic, in which case the expected arities list contained duplicates arities, which resulted in 1) a surprising error message, and 2) a wrongly triggered hint about polymorphic functions.