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T7959.hs:5:1: error:
• Can't make a derived instance of ‘A’:
• In the stand-alone deriving instance for ‘A’
Suggested fix: Perhaps you intended to use DeriveAnyClass
T7959.hs:6:17: error:
• ‘A’ is not a unary constraint, as expected by a deriving clause
• In the data declaration for ‘B’
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