testsuite/tests/deriving/should_fail/T7959.stderr


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T7959.hs:5:1: error:
    • Cannot derive instances for nullary classes
    • In the stand-alone deriving instance for ‘A’

T7959.hs:6:17: error:
    • ‘A’ is not a unary constraint, as expected by a deriving clause
    • In the data declaration for ‘B’