SOURCE_FILE@0..21
  FN@0..20
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..4
      IDENT@3..4 "f"
    PARAM_LIST@4..6
      L_PAREN@4..5 "("
      R_PAREN@5..6 ")"
    WHITESPACE@6..7 " "
    BLOCK_EXPR@7..20
      L_CURLY@7..8 "{"
      WHITESPACE@8..9 " "
      EFFECT_EXPR@9..18
        CONST_KW@9..14 "const"
        WHITESPACE@14..15 " "
        BLOCK_EXPR@15..18
          L_CURLY@15..16 "{"
          WHITESPACE@16..17 " "
          R_CURLY@17..18 "}"
      WHITESPACE@18..19 " "
      R_CURLY@19..20 "}"
  WHITESPACE@20..21 "\n"