CODEWITHSUNDEEP
ocaml
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Reputation: 9110

OCaml: Global Module Binding

I am working on a OCaml project, and I would like to declare some global bindings for external modules. For example:

module Test = struct

  open Another_module

  let module AM = Another_module 


  let func1 a =
     AM.process a

  let func2 a =
     AM.process a

end

However, when I compile some code organized as above, I always got a compile error for the global module binding sentence..

Parse error: "in" expected after [module_binding0] (in [str_item])

Am I doing anything wrong here? Could anyone give me some help? Thank you!

Upvotes: 0

Views: 115

Answers (1)

Gilles 'SO- stop being evil'
Gilles 'SO- stop being evil'

Reputation: 107759

The syntax of a module definition inside a structure is

module Name = module-expression

The keyword sequence let module is only used for a local binding of a module:

let module Name = module-expression in Name.x + Name.y

So you need to write

module Test = struct
  module AM = Another_module 
  let func1 a =
     AM.process a
end

Note that module AM = Another_module does not make the module names AM and Another_module completely interchangeable: they aren't equivalent when used in the argument to a functor, due to the way .

Upvotes: 2

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