anchor.diff:          oneShotInterceptorNames = new Map<Selector, String>(),
           shortPrivateNameOwners = new Map<String, LibraryElement>(),
           bailoutNames = new Map<Element, String>(),
  -        usedBailoutInstanceNames = new Set<String>(),
           usedGlobalNames = new Set<String>(),
           usedInstanceNames = new Set<String>(),
           instanceNameMap = new Map<String, String>(),
  
positive.code:     if (global) {
        name = getMappedGlobalName(unminifiedName);
      } else {
        name = unminifiedName;
        int i = 0;
        while (usedBailoutInstanceNames.contains(name)) {
          name = '$unminifiedName${i++}';
        }
        usedBailoutInstanceNames.add(name);
        name = getMappedInstanceName(name);
      }
      bailoutNames[element] = name;
  
negative.code:   final Map<String, String> operatorNameMap;
    final Map<String, int> popularNameCounters;
  
    final Map<Element, String> bailoutNames;
  
    final Map<Constant, String> constantNames;
  