I didn't say constructor arguments don't have tuple semantics :). In OCaml tuples are a "unit", i.e. you can't use (,) as an operator. In that sense they match with the constructor semantics: it needs all its arguments at once. It's the constructors not being functions that I was complaining about. Also, I'd say that capitalisation alone is not enough to compensate for constructors looking like they're curried functions. But that's just a matter of taste.