T9774.hs:5:29:
    Couldn't match type ‘Char’ with ‘[Char]’
    Expected type: String
      Actual type: Char
    In the second argument of ‘assert’, namely ‘'a'’
    In the first argument of ‘putStrLn’, namely ‘(assert True 'a')’
    In the expression: putStrLn (assert True 'a')