drvfail004.stderr 306 Bytes
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drvfail004.hs:8:12:
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    No instance for (Eq (Foo a b))
      arising from the 'deriving' clause of a data type declaration
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    Possible fix:
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      use a standalone 'deriving instance' declaration,
        so you can specify the instance context yourself
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    When deriving the instance for (Ord (Foo a b))