SOURCE_FILE@0..42
  FN@0..41
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..7
      IDENT@3..7 "main"
    PARAM_LIST@7..9
      L_PAREN@7..8 "("
      R_PAREN@8..9 ")"
    WHITESPACE@9..10 " "
    BLOCK_EXPR@10..41
      L_CURLY@10..11 "{"
      WHITESPACE@11..16 "\n    "
      EXPR_STMT@16..24
        LAMBDA_EXPR@16..24
          PARAM_LIST@16..18
            PIPE@16..17 "|"
            PIPE@17..18 "|"
          WHITESPACE@18..19 " "
          RET_TYPE@19..24
            THIN_ARROW@19..21 "->"
            WHITESPACE@21..22 " "
            TUPLE_TYPE@22..24
              L_PAREN@22..23 "("
              R_PAREN@23..24 ")"
      WHITESPACE@24..25 " "
      EXPR_STMT@25..39
        EFFECT_EXPR@25..38
          UNSAFE_KW@25..31 "unsafe"
          WHITESPACE@31..32 " "
          BLOCK_EXPR@32..38
            L_CURLY@32..33 "{"
            WHITESPACE@33..34 " "
            TUPLE_EXPR@34..36
              L_PAREN@34..35 "("
              R_PAREN@35..36 ")"
            WHITESPACE@36..37 " "
            R_CURLY@37..38 "}"
        SEMICOLON@38..39 ";"
      WHITESPACE@39..40 "\n"
      R_CURLY@40..41 "}"
  WHITESPACE@41..42 "\n"
error 24..24: expected a block
error 24..24: expected SEMICOLON