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T15839a.hs:6:30: warning: [-Wderiving-defaults (in -Wdefault)]
⢠Both DeriveAnyClass and GeneralizedNewtypeDeriving are enabled
Defaulting to the DeriveAnyClass strategy for instantiating C
⢠In the newtype declaration for âTâ
Suggested fix:
Use DerivingStrategies to pick a different strategy
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