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T5934.hs:12:7: error:
    • Couldn't match expected type ‘(forall s. GenST s) -> Int’
                  with actual type ‘a0’
      Cannot instantiate unification variable ‘a0’
      with a type involving polytypes: (forall s. GenST s) -> Int
    • In the expression: 0
      In an equation for ‘run’: run = 0