digraph block {
    N0[label="entry"];
    N1[label="exit"];
    N2[label="expr E13b"];
    N3[label="expr 13"];
    N4[label="expr E13b(13)"];
    N5[label="local x"];
    N6[label="local _y"];
    N7[label="expr x"];
    N8[label="expr match x { E13a => _y = 1, E13b(v) => _y = v + 1 }"];
    N9[label="local E13a"];
    N10[label="expr 1"];
    N11[label="expr _y"];
    N12[label="expr _y = 1"];
    N13[label="local v"];
    N14[label="pat E13b(v)"];
    N15[label="expr v"];
    N16[label="expr 1"];
    N17[label="expr v + 1"];
    N18[label="expr _y"];
    N19[label="expr _y = v + 1"];
    N20[label="block {\l    let x = E13b(13);\l    let _y;\l    match x { E13a => _y = 1, E13b(v) => _y = v + 1 }\l}\l"];
    N0 -> N2;
    N2 -> N3;
    N3 -> N4;
    N4 -> N5;
    N5 -> N6;
    N6 -> N7;
    N7 -> N9;
    N9 -> N10;
    N10 -> N11;
    N11 -> N12;
    N12 -> N8;
    N7 -> N13;
    N13 -> N14;
    N14 -> N15;
    N15 -> N16;
    N16 -> N17;
    N17 -> N18;
    N18 -> N19;
    N19 -> N8;
    N8 -> N20;
    N20 -> N1;
}