Forgive me for asking what might be an easy question, I am just a 
beginner with Ocaml.  I want to do something like this:

module M = if arg then M1 else M2
module A = F (M)
(* define rest of program using fields of A *)

The idea being that arg will come from e.g. the command line, and 
modules M1, M2 and functor F are defined elsewhere.

Of course "module M = if ...  " is a syntax error.   My question is: 
how to achieve this behaviour (and generalisations of it) in ocaml?

It seems that this is an obvious thing to want to do but I haven't 
found any clues in the manual or the FAQs.  Is it me?

-r

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