assignment--do-while-qq.js

/*expected
initial->s1_1->s1_2->s1_3->s1_2->s1_2;
s1_3->s1_4;
s1_2->s1_4->final;
*/
do {
    foo();
} while (a ??= b);

/*DOT
digraph {
    node[shape=box,style="rounded,filled",fillcolor=white];
    initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];
    final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];
    s1_1[label="Program:enter\nDoWhileStatement:enter"];
    s1_2[label="BlockStatement:enter\nExpressionStatement:enter\nCallExpression:enter\nIdentifier (foo)\nCallExpression:exit\nExpressionStatement:exit\nBlockStatement:exit\nAssignmentExpression:enter\nIdentifier (a)"];
    s1_3[label="Identifier (b)\nAssignmentExpression:exit"];
    s1_4[label="DoWhileStatement:exit\nProgram:exit"];
    initial->s1_1->s1_2->s1_3->s1_2->s1_2;
    s1_3->s1_4;
    s1_2->s1_4->final;
}
*/