> Because "include" only applies to modules that are structures, since it 
> is meant to copy its fields to the current scope. In your example 
> however, Elt has some abstract module type T, so it does not meet that 
> requirement. What should the include mean if you applied the outer F like
> 
>    F (struct module type T = functor (X : sig end) -> sig end end)
> 
> ? And how could you express the result type of F without knowing the 
> structure of Elt?
> 
> Cheers,
> 
> 	- Andreas
> 
Mm-hm, I see.
Thank you.

Keiko

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