Usually I tend not to give much information to a subroutine intending to restrict its liberty of touching the calling information.....
So if I have an instance Inst which should be changed by an outside-Inst computation Sub and I'm calling Sub with Sub(I'),I try to build the story so that Sub can only read Inst or a part of it (I') and return some specially structured information which then I use "inside" Inst to change Inst's state (horribble speech).
The feeling I get with Haskell, is that S should have the freedom of changing I and return just I (changed).
Is it any right ??
grazie Paolino
-- ....lotta dura per la verdura
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