drvfail004.stderr 463 Bytes
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drvfail004.hs:8:12: error:
    • Could not deduce (Eq (Foo a b))
        arising from the 'deriving' clause of a data type declaration
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      from the context: (Ord a, Ord b)
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        bound by the deriving clause for ‘Ord (Foo a b)’
        at drvfail004.hs:8:12-14
      Possible fix:
        use a standalone 'deriving instance' declaration,
          so you can specify the instance context yourself
    • When deriving the instance for (Ord (Foo a b))