[tlaplus] how to updating state and return in a definition

[Balaji Arun <ba2669@xxxxxx>]

I am trying to have a specification with a definition for Calculate()

module A:

VARIABLE val

Calculate() ==
   val' = val + 1
   (*return [v: val] here*)

How do I return that val to whoever is calling it (even another module that instantiates module A)? Assuming multiple processes call Calculate concurrently.

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