SOURCE_FILE@0..52
  FN_DEF@0..51
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..6
      IDENT@3..6 "foo"
    PARAM_LIST@6..8
      L_PAREN@6..7 "("
      R_PAREN@7..8 ")"
    WHITESPACE@8..9 " "
    BLOCK_EXPR@9..51
      L_CURLY@9..10 "{"
      WHITESPACE@10..15 "\n    "
      EXPR_STMT@15..18
        BLOCK_EXPR@15..17
          L_CURLY@15..16 "{"
          R_CURLY@16..17 "}"
        SEMICOLON@17..18 ";"
      WHITESPACE@18..23 "\n    "
      EXPR_STMT@23..33
        EFFECT_EXPR@23..32
          UNSAFE_KW@23..29 "unsafe"
          WHITESPACE@29..30 " "
          BLOCK_EXPR@30..32
            L_CURLY@30..31 "{"
            R_CURLY@31..32 "}"
        SEMICOLON@32..33 ";"
      WHITESPACE@33..38 "\n    "
      EXPR_STMT@38..49
        EFFECT_EXPR@38..48
          LABEL@38..45
            LIFETIME@38..44 "\'label"
            COLON@44..45 ":"
          WHITESPACE@45..46 " "
          BLOCK_EXPR@46..48
            L_CURLY@46..47 "{"
            R_CURLY@47..48 "}"
        SEMICOLON@48..49 ";"
      WHITESPACE@49..50 "\n"
      R_CURLY@50..51 "}"
  WHITESPACE@51..52 "\n"