testsuite/tests/th/T12478_4.stderr


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T12478_4.hs:7:7: error:
    • Illegal sum arity: 1
        Sums must have an arity of at least 2
      When splicing a TH type: (#  #) GHC.Tuple.()
    • In the untyped splice: $(unboxedSumT 1 `appT` conT ''())