testsuite/tests/typecheck/should_compile/T15839a.stderr


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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 ‘T’
    Suggested fix:
      Use DerivingStrategies to pick a different strategy