testsuite/tests/typecheck/should_fail/tcfail020.stderr


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tcfail020.hs:10:10: error: [GHC-39999]
    • Could not deduce ‘A [a]’
        arising from the superclasses of an instance declaration
      from the context: A a
        bound by the instance declaration at tcfail020.hs:10:10-23
    • In the instance declaration for ‘B [a]’