testsuite/tests/typecheck/should_fail/tcfail020.stderr


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tcfail020.hs:10:10:
    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]’