SOURCE_FILE@0..23
  FN@0..22
    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..22
      L_CURLY@7..8 "{"
      WHITESPACE@8..9 " "
      EXPR_STMT@9..20
        EFFECT_EXPR@9..19
          LABEL@9..16
            LIFETIME@9..15 "\'label"
            COLON@15..16 ":"
          WHITESPACE@16..17 " "
          BLOCK_EXPR@17..19
            L_CURLY@17..18 "{"
            R_CURLY@18..19 "}"
        SEMICOLON@19..20 ";"
      WHITESPACE@20..21 " "
      R_CURLY@21..22 "}"
  WHITESPACE@22..23 "\n"