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Andrei Paskevich authored
Currently, the builtin theory why3.HighOrd (or just HighOrd) must be explicitly "use"-d. However, the type (HighOrd.func 'a 'b) can be written ('a -> 'b), and the type (HighOrd.pred 'a) can be written ('a -> bool), and the application operation (HighOrd.(@)) can be written as the usual juxtaposition. Thus, normally, you do not have to write the qualifiers. The builtin theory why3.Bool (or just Bool) is needed for "bool". The names "HighOrd", "func", "pred", and "(@)" are not yet fixed and may change. "eliminate_epsilon" tries to be smart when a lambda (or some other comprehension form) occurs under equality or at the top of a definition. We could go even further and replace (\ x . t) s with t[x <- s], without lifting the lambda. I'm not sure it's worth it: we rarely write redexes manually. They can and will appear through inlining, though. Anyone who wants to construct epsilon-terms directly using the API should remember that these are not Hilbert's epsilons: by writ...
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