digraph block {
    N0[label="entry"];
    N1[label="exit"];
    N2[label="expr 2"];
    N3[label="expr 0"];
    N4[label="expr 20"];
    N5[label="expr [2, 0, 20]"];
    N6[label="local v"];
    N7[label="stmt let v = [2, 0, 20];"];
    N8[label="expr v"];
    N9[label="expr 20"];
    N10[label="expr v[20]"];
    N11[label="stmt v[20];"];
    N12[label="block { let v = [2, 0, 20]; v[20]; }"];
    N0 -> N2;
    N2 -> N3;
    N3 -> N4;
    N4 -> N5;
    N5 -> N6;
    N6 -> N7;
    N7 -> N8;
    N8 -> N9;
    N9 -> N10;
    N10 -> N11;
    N11 -> N12;
    N12 -> N1;
}