You can create first-class values of this module type, and since values have types, "it" is a type. Specifically, my_foobar has type (module FOOBAR). Actually

You can create first-class values of this module type, and since values have types, "it" is a type. Specifically, my_foobar has type (module FOOBAR). Actually getting values out of such a module-typed structure does involve some ceremony, however: let f = let module M = (val my_foobar) in M.foo