1  >var x = 10;

    ~~~~~~~~~~~~                                  => Pos: (0 to 11)  SpanInfo: {"start":0,"length":10}
    >var x = 10
    >:=> (line 1, col 0) to (line 1, col 10)
--------------------------------
2  >var y = 20;

    ~~~~~~~~~~~~                                  => Pos: (12 to 23)  SpanInfo: {"start":12,"length":10}
    >var y = 20
    >:=> (line 2, col 0) to (line 2, col 10)
--------------------------------
3  >x += 30;

    ~~~~~~~~~                                     => Pos: (24 to 32)  SpanInfo: {"start":24,"length":7}
    >x += 30
    >:=> (line 3, col 0) to (line 3, col 7)
--------------------------------
4  >x *= 0;

    ~~~~~~~~                                      => Pos: (33 to 40)  SpanInfo: {"start":33,"length":6}
    >x *= 0
    >:=> (line 4, col 0) to (line 4, col 6)
--------------------------------
5  >x = x + 1;

    ~~~~~~~~~~~                                   => Pos: (41 to 51)  SpanInfo: {"start":41,"length":9}
    >x = x + 1
    >:=> (line 5, col 0) to (line 5, col 9)
--------------------------------
6  >x = (function foo() {

    ~~~                                           => Pos: (52 to 54)  SpanInfo: {"start":52,"length":44}
    >x = (function foo() {
    >    return y;
    >})() + y
    >:=> (line 6, col 0) to (line 8, col 8)
6  >x = (function foo() {

       ~~                                         => Pos: (55 to 56)  SpanInfo: {"start":56,"length":36}
    >(function foo() {
    >    return y;
    >})()
    >:=> (line 6, col 4) to (line 8, col 4)
6  >x = (function foo() {

         ~~~~~~~~~~~~~~~~~                        => Pos: (57 to 73)  SpanInfo: {"start":78,"length":8}
    >return y
    >:=> (line 7, col 4) to (line 7, col 12)
--------------------------------
7  >    return y;

    ~~~~~~~~~~~~~~                                => Pos: (74 to 87)  SpanInfo: {"start":78,"length":8}
    >return y
    >:=> (line 7, col 4) to (line 7, col 12)
--------------------------------
8  >})() + y;

    ~                                             => Pos: (88 to 88)  SpanInfo: {"start":88,"length":1}
    >}
    >:=> (line 8, col 0) to (line 8, col 1)
8  >})() + y;

     ~~~                                          => Pos: (89 to 91)  SpanInfo: {"start":56,"length":36}
    >(function foo() {
    >    return y;
    >})()
    >:=> (line 6, col 4) to (line 8, col 4)
8  >})() + y;

        ~~~~~~                                    => Pos: (92 to 97)  SpanInfo: {"start":52,"length":44}
    >x = (function foo() {
    >    return y;
    >})() + y
    >:=> (line 6, col 0) to (line 8, col 8)
--------------------------------
9  >x = y + 30 + (function foo() {

    ~~~~~~~~~~~~                                  => Pos: (98 to 109)  SpanInfo: {"start":98,"length":54}
    >x = y + 30 + (function foo() {
    >    return y;
    >})() * 40
    >:=> (line 9, col 0) to (line 11, col 9)
9  >x = y + 30 + (function foo() {

                ~~                                => Pos: (110 to 111)  SpanInfo: {"start":111,"length":36}
    >(function foo() {
    >    return y;
    >})()
    >:=> (line 9, col 13) to (line 11, col 4)
9  >x = y + 30 + (function foo() {

                  ~~~~~~~~~~~~~~~~~               => Pos: (112 to 128)  SpanInfo: {"start":133,"length":8}
    >return y
    >:=> (line 10, col 4) to (line 10, col 12)
--------------------------------
10 >    return y;

    ~~~~~~~~~~~~~~                                => Pos: (129 to 142)  SpanInfo: {"start":133,"length":8}
    >return y
    >:=> (line 10, col 4) to (line 10, col 12)
--------------------------------
11 >})() * 40;
    ~                                             => Pos: (143 to 143)  SpanInfo: {"start":143,"length":1}
    >}
    >:=> (line 11, col 0) to (line 11, col 1)
11 >})() * 40;
     ~~~                                          => Pos: (144 to 146)  SpanInfo: {"start":111,"length":36}
    >(function foo() {
    >    return y;
    >})()
    >:=> (line 9, col 13) to (line 11, col 4)
11 >})() * 40;
        ~~~~~~                                    => Pos: (147 to 152)  SpanInfo: {"start":98,"length":54}
    >x = y + 30 + (function foo() {
    >    return y;
    >})() * 40
    >:=> (line 9, col 0) to (line 11, col 9)