SOURCE_FILE@0..95
  FN@0..52
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..6
      IDENT@3..6 "foo"
    PARAM_LIST@6..49
      L_PAREN@6..7 "("
      PARAM@7..48
        BIND_PAT@7..8
          NAME@7..8
            IDENT@7..8 "x"
        COLON@8..9 ":"
        WHITESPACE@9..10 " "
        IMPL_TRAIT_TYPE@10..48
          IMPL_KW@10..14 "impl"
          WHITESPACE@14..15 " "
          TYPE_BOUND_LIST@15..48
            TYPE_BOUND@15..48
              PATH_TYPE@15..48
                PATH@15..48
                  PATH@15..26
                    PATH@15..18
                      PATH_SEGMENT@15..18
                        NAME_REF@15..18
                          IDENT@15..18 "std"
                    COLON2@18..20 "::"
                    PATH_SEGMENT@20..26
                      NAME_REF@20..26
                        IDENT@20..26 "future"
                  COLON2@26..28 "::"
                  PATH_SEGMENT@28..48
                    NAME_REF@28..34
                      IDENT@28..34 "Future"
                    TYPE_ARG_LIST@34..48
                      L_ANGLE@34..35 "<"
                      ASSOC_TYPE_ARG@35..47
                        NAME_REF@35..41
                          IDENT@35..41 "Output"
                        WHITESPACE@41..42 " "
                        EQ@42..43 "="
                        WHITESPACE@43..44 " "
                        PATH_TYPE@44..47
                          PATH@44..47
                            PATH_SEGMENT@44..47
                              NAME_REF@44..47
                                IDENT@44..47 "i32"
                      R_ANGLE@47..48 ">"
      R_PAREN@48..49 ")"
    WHITESPACE@49..50 " "
    BLOCK_EXPR@50..52
      L_CURLY@50..51 "{"
      R_CURLY@51..52 "}"
  WHITESPACE@52..54 "\n\n"
  FN@54..94
    FN_KW@54..56 "fn"
    WHITESPACE@56..57 " "
    NAME@57..61
      IDENT@57..61 "main"
    PARAM_LIST@61..63
      L_PAREN@61..62 "("
      R_PAREN@62..63 ")"
    WHITESPACE@63..64 " "
    BLOCK_EXPR@64..94
      L_CURLY@64..65 "{"
      WHITESPACE@65..70 "\n    "
      CALL_EXPR@70..92
        PATH_EXPR@70..73
          PATH@70..73
            PATH_SEGMENT@70..73
              NAME_REF@70..73
                IDENT@70..73 "foo"
        ARG_LIST@73..92
          L_PAREN@73..74 "("
          EFFECT_EXPR@74..91
            ASYNC_KW@74..79 "async"
            WHITESPACE@79..80 " "
            MOVE_KW@80..84 "move"
            WHITESPACE@84..85 " "
            BLOCK_EXPR@85..91
              L_CURLY@85..86 "{"
              WHITESPACE@86..87 " "
              LITERAL@87..89
                INT_NUMBER@87..89 "12"
              WHITESPACE@89..90 " "
              R_CURLY@90..91 "}"
          R_PAREN@91..92 ")"
      WHITESPACE@92..93 "\n"
      R_CURLY@93..94 "}"
  WHITESPACE@94..95 "\n"