T5934.stderr 278 Bytes
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T5934.hs:12:7: error:
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    • Cannot instantiate unification variable ‘a0’
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      with a type involving polytypes: (forall s. GenST s) -> Int
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        GHC doesn't yet support impredicative polymorphism
    • In the expression: 0
      In an equation for ‘run’: run = 0