get-transformer-module in drscheme:language:module-based-language<%>
This method specifies the module that defines the transformation language. It is used to initialize the transformer portion of the user's namespace.
The result is expected to be the
specification of a module
except as value, ie quoted or #f.
If the result is #f, no module is required into the
transformer part of the namespace.
See also
get-module.