src/test/run-make/graphviz-flowgraph/f01.dot-expected.dot

   1 digraph block {
   2     N0[label="entry"];
   3     N1[label="exit"];
   4     N2[label="expr 1"];
   5     N3[label="stmt 1;"];
   6     N4[label="block { 1; }"];
   7     N0 -> N2;
   8     N2 -> N3;
   9     N3 -> N4;
  10     N4 -> N1;
  11 }