testsuite/tests/typecheck/should_fail/T6161.stderr


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T6161.hs:19:10:
    Could not deduce (Super (Fam a))
      arising from the superclasses of an instance declaration
    from the context: Foo a
      bound by the instance declaration at T6161.hs:19:10-31
    In the instance declaration for ‘Duper (Fam a)’