old_contents: from viper.lexer import (
      NEWLINE as NL, INDENT as IND, DEDENT as DED, COLON, OPEN_PAREN as OP, CLOSE_PAREN as CP, ARROW, ENDMARKER as EM,
      Number as Num,
      Name as N, ReservedName as RN,
      Class as C,
      Operator as Op,
  )
  
  
  lexemes = [
      RN('def'), N('fib'), OP, N('n'), COLON, C('Int'), CP, ARROW, C('Int'), COLON,
      NL, IND,
          N('if'), N('n'), Op('=='), Num('1'), N('or'), N('n'), Op('=='), Num('2'), COLON,
          NL, IND,
              RN('return'), Num('1'), NL,
          DED,
          RN('return'), N('fib'), OP, N('n'), Op('-'), Num('1'), CP, Op('+'), N('fib'), OP, N('n'), Op('-'), Num('2'), CP, NL,
      DED,
      EM,
  ]
  
new_contents: from viper.lexer import (
      NEWLINE as NL, INDENT as IND, DEDENT as DED, COLON, OPEN_PAREN as OP, CLOSE_PAREN as CP, ARROW, ENDMARKER as EM,
      Number as Num,
      Name as N, ReservedName as RN,
      Class as C,
      Operator as Op,
  )
  
  
  lexemes = [
      RN('def'), N('fib'), OP, N('n'), COLON, C('Int'), CP, ARROW, C('Int'), COLON,
      NL, IND,
          RN('if'), N('n'), Op('=='), Num('1'), N('or'), N('n'), Op('=='), Num('2'), COLON,
          NL, IND,
              RN('return'), Num('1'), NL,
          DED,
          RN('return'), N('fib'), OP, N('n'), Op('-'), Num('1'), CP, Op('+'), N('fib'), OP, N('n'), Op('-'), Num('2'), CP, NL,
      DED,
      EM,
  ]
  
subject: Update fib.py