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T1897a.hs:9:1:
    Could not deduce (Wob a0 b)
      arising from the ambiguity check for `foo'
    from the context (Wob a b)
      bound by the inferred type for `foo': Wob a b => b -> [b]
      at T1897a.hs:9:1-24
    The type variable `a0' is ambiguous
    When checking that `foo'
      has the inferred type `forall a b. Wob a b => b -> [b]'
    Probable cause: the inferred type is ambiguous