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main =  do
        putStrLn "Sum all natural numbers from 1 to? "
        integerInput <- readLn
        (print . sum ) [1..integerInput]

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• # 2:   hide show   clone   input   116 days 0 hours ago    Success

  result: Success     time: 0.01s    memory: 3716 kB     returned value: 0

  input:

  5
  

  output:

  Sum all natural numbers from 1 to? 
  15
  
• # 1:   hide show   clone   input   116 days 1 hour ago    Runtime error

  result: Runtime error     time: 0.01s    memory: 3716 kB     signal: -1

  input: no
  output:

  Sum all natural numbers from 1 to? 
  

  stderr:

  prog: <stdin>: hGetLine: end of file