[Haskell-cafe] Deriving Eq and Show instances for testing

[Anakreontas]

I have datatypes for which I need an Eq and Show instance only for testing. 
I could derive those instances in the datatype declaration but I prefer not 
to add unnecessary functionality. With StandaloneDeriving extension I can 
derive the instances in the test module but this produces many warning 
about orphan instances. Is there a better approach or a way to stop reports 
about orphan instance warnings?

Regards
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