testsuite/tests/typecheck/should_fail/T6161.stderr


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T6161.hs:19:10: error:
    • 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)’