//set flag JSONSpecialIntegral_debug.

svoid test_JSONSpecialIntegral() {
  new JSONSpecialIntegral integral;
  integral.analyze([[{"abcdefghijklmnop": "abcdefghijklmnopq", "abcdefghijklmnopq": ["abc","abcdefghijklmnop"]}]]);
  print(integral.stats()); 
  print(sfuWithIndent(1, integral));
  int n = integral.n();
  
  embedded void descend(int i, int iEnd, int remainingDepth) {
    printVars descend(i, iEnd, remainingDepth);
    if (i >= iEnd || remainingDepth <= 0) ret; // out of characters or depth
    
    // bracket level at start, bracket level at end
    
    int lvlLeft = integral.bracketLevel(i-1);
    int lvlRight = integral.bracketLevel(iEnd-1);
    
    // count at start, count at end

    int cntLeft = integral.bracketCount(i-1);
    int cntRight = integral.bracketCount(iEnd-1);
    int brackets = cntRight-cntLeft;
    
    print("Brackets in range " + i + " to " + iEnd + ": " + brackets);
    if (brackets == 0) ret;
    
    int iMid = (i+iEnd) >> 1;
    descend(i, i, iMid);
    descend(i, iMid, iEnd);
  }
  
  int lvl = integral.bracketLevel(n-1);
  if (lvl != 0)
    fail("Bad brackets: level at end is " + lvl);
    
  int depth = 1;
  descend(0, n, depth);
}

Began life as a copy of #1032590