Set: pp::colors
  Set: pp::unicode
  Assumed: first
  Assumed: a
  Assumed: b
  Assumed: c
  Assumed: f
f a
Error (line: 10, pos: 5) unknown identifier 'f'
Variable first : Bool
10 + 20 : ℤ
Error (line: 19, pos: 9) unknown identifier '++'
Error (line: 21, pos: 0) main scope cannot be removed