tcfail154.stderr 291 Bytes
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tcfail154.hs:12:0:
    Non-type variables, or repeated type variables,
      in the constraint: C a a
    (Use -fallow-undecidable-instances to permit this)
    In the context: (C a a)
    While checking the context of an instance declaration
    In the instance declaration for `Eq (T a)'