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Date: | 2002-06-01 (08:37) |
From: | Jacques Garrigue <garrigue@k...> |
Subject: | Re: [Caml-list] about Obj.magic |
From: dengping zhu <zhudp@cs.bu.edu> > After carefully checking my code, I tried to remove Obj.magic from my > code. Anyway, at last I have to keep one which is not the case you guys > mentioned. My code is very simple: > > ----------- > type ty = ty1 -> ty2 > > (* where ty1, ty2 are some types I defined before, ty1 is some type like > g * h, while ty2 likes c * d * e * f. *) > > > let x = (f (g)) a > > ----------- > Here, f and g are functions, and the return type of (f (g)) is ty, which > is a function type ty1 -> ty2. While, the type of a is ty1. So, the > return type of (f (g)) a should be ty2. Anyway, every time I get an > error here. The error message is: You applied too many > parameters... The behaviour you describe definitely looks like a bug in the compiler. But I couldn't reproduce your problem, so I would need the real code (or a simplified version of it) to check whether this is really a bug. Another reason might be difference in behaviour between SML and Caml modules and functors. In Caml all signatures are opaque. To check this try writing let x = (f (g) : ty1 -> ty2) a If you get an error saying that ty is not compatible with ty1 -> ty2, then this probably means that ty is abstract. This may happen if you define a signature in which ty appears without the equation ty = ty1 -> ty2. Adding the equation should solve the problem. Hope this helps, but your description is to incomplete to conclude anything. Jacques Garrigue ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners