[plt-scheme] transformers after expansion no longer needed

When running a module in DrScheme, the transformers used during expansion cannot be discarded, because they may be used in the interactions window. However, in many cases I no longer need the transformers after expansion. Is there a way to make them garbage collectable as soon as expansion is completed?

How is this in a stand alone compiled module? It does not have to save the transformers for the interactions window, for there is none. What happens in this case with the transformers after expansion?

Jos
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