1  >var a = 10;

    ~~~~~~~~~~~~                                  => Pos: (0 to 11)  SpanInfo: {"start":0,"length":10}
    >var a = 10
    >:=> (line 1, col 0) to (line 1, col 10)
--------------------------------
2  >while (a == 10) {

    ~~~~~~~~~~~~~~~~~~                            => Pos: (12 to 29)  SpanInfo: {"start":12,"length":15}
    >while (a == 10)
    >:=> (line 2, col 0) to (line 2, col 15)
--------------------------------
3  >    a++;

    ~~~~~~~~~                                     => Pos: (30 to 38)  SpanInfo: {"start":34,"length":3}
    >a++
    >:=> (line 3, col 4) to (line 3, col 7)
--------------------------------
4  >}

    ~~                                            => Pos: (39 to 40)  SpanInfo: {"start":34,"length":3}
    >a++
    >:=> (line 3, col 4) to (line 3, col 7)
--------------------------------
5  >while (a == 10) 

    ~~~~~~~~~~~~~~~~~                             => Pos: (41 to 57)  SpanInfo: {"start":41,"length":15}
    >while (a == 10)
    >:=> (line 5, col 0) to (line 5, col 15)
--------------------------------
6  >{

    ~~                                            => Pos: (58 to 59)  SpanInfo: {"start":64,"length":3}
    >a++
    >:=> (line 7, col 4) to (line 7, col 7)
--------------------------------
7  >    a++;

    ~~~~~~~~~                                     => Pos: (60 to 68)  SpanInfo: {"start":64,"length":3}
    >a++
    >:=> (line 7, col 4) to (line 7, col 7)
--------------------------------
8  >}

    ~~                                            => Pos: (69 to 70)  SpanInfo: {"start":64,"length":3}
    >a++
    >:=> (line 7, col 4) to (line 7, col 7)
--------------------------------
9  >while (a == 10)  a++;

    ~~~~~~~~~~~~~~~                               => Pos: (71 to 85)  SpanInfo: {"start":71,"length":15}
    >while (a == 10)
    >:=> (line 9, col 0) to (line 9, col 15)
9  >while (a == 10)  a++;

                   ~~~~~~~                        => Pos: (86 to 92)  SpanInfo: {"start":88,"length":3}
    >a++
    >:=> (line 9, col 17) to (line 9, col 20)
--------------------------------
10 >while (a == 10) 

    ~~~~~~~~~~~~~~~~~                             => Pos: (93 to 109)  SpanInfo: {"start":93,"length":15}
    >while (a == 10)
    >:=> (line 10, col 0) to (line 10, col 15)
--------------------------------
11 >    a++;

    ~~~~~~~~~                                     => Pos: (110 to 118)  SpanInfo: {"start":114,"length":3}
    >a++
    >:=> (line 11, col 4) to (line 11, col 7)
--------------------------------
12 >while ((function () {

    ~~~~~~~                                       => Pos: (119 to 125)  SpanInfo: {"start":119,"length":52}
    >while ((function () {
    >    return 30 * a;
    >})() !== a)
    >:=> (line 12, col 0) to (line 14, col 11)
12 >while ((function () {

           ~                                      => Pos: (126 to 126)  SpanInfo: {"start":126,"length":38}
    >(function () {
    >    return 30 * a;
    >})()
    >:=> (line 12, col 7) to (line 14, col 4)
12 >while ((function () {

            ~~~~~~~~~~~~~~                        => Pos: (127 to 140)  SpanInfo: {"start":145,"length":13}
    >return 30 * a
    >:=> (line 13, col 4) to (line 13, col 17)
--------------------------------
13 >    return 30 * a;

    ~~~~~~~~~~~~~~~~~~~                           => Pos: (141 to 159)  SpanInfo: {"start":145,"length":13}
    >return 30 * a
    >:=> (line 13, col 4) to (line 13, col 17)
--------------------------------
14 >})() !== a) {

    ~                                             => Pos: (160 to 160)  SpanInfo: {"start":160,"length":1}
    >}
    >:=> (line 14, col 0) to (line 14, col 1)
14 >})() !== a) {

     ~~~                                          => Pos: (161 to 163)  SpanInfo: {"start":126,"length":38}
    >(function () {
    >    return 30 * a;
    >})()
    >:=> (line 12, col 7) to (line 14, col 4)
14 >})() !== a) {

        ~~~~~~~                                   => Pos: (164 to 170)  SpanInfo: {"start":119,"length":52}
    >while ((function () {
    >    return 30 * a;
    >})() !== a)
    >:=> (line 12, col 0) to (line 14, col 11)
14 >})() !== a) {

               ~~~                                => Pos: (171 to 173)  SpanInfo: {"start":178,"length":3}
    >a--
    >:=> (line 15, col 4) to (line 15, col 7)
--------------------------------
15 >    a--;

    ~~~~~~~~~                                     => Pos: (174 to 182)  SpanInfo: {"start":178,"length":3}
    >a--
    >:=> (line 15, col 4) to (line 15, col 7)
--------------------------------
16 >}
    ~                                             => Pos: (183 to 183)  SpanInfo: {"start":178,"length":3}
    >a--
    >:=> (line 15, col 4) to (line 15, col 7)