anchor.diff:                seq
                   testDone <= False;
                   $display("=== Depth %0d, Test %0d ===", currentDepth, testNum);
  +                params.preStmt;
                   while (! testDone)
                     action
                       await(!waitWire);
  
positive.code:     seq
        randomState.cntrl.init;
        testDone <= False;
        $display("=== Depth %0d, Test %0d ===", currentDepth, testNum);
        while (! testDone)
          action
  
negative.code:                       end
                    endaction
                  testNum <= testNum+1;
                  params.postStmt;
                  idParams.rst.assertReset();
                endseq
              currentDepth <= idParams.incDepth(currentDepth);
  