anchor.diff:        ..experimentToBoolean = _hasOption(options, Flags.experimentToBoolean)
         ..experimentCallInstrumentation =
             _hasOption(options, Flags.experimentCallInstrumentation)
  -      ..useNewRti = !_hasOption(options, Flags.useOldRti)
         ..generateSourceMap = !_hasOption(options, Flags.noSourceMaps)
         ..outputUri = _extractUriOption(options, '--out=')
         ..platformBinaries = platformBinaries
  
positive.code:   bool experimentCallInstrumentation = false;
  
    /// Whether to use the new RTI representation (default).
    bool useNewRti = true;
  
    /// Whether null-safety (non-nullable types) are enabled in the sdk.
    ///
  
negative.code:     }
  
      if (benchmarkingExperiment) {
        // Set flags implied by '--benchmarking-x'.
        // TODO(sra): Use this for some NNBD variant.
      }
  
      if (_noLegacyJavaScript) legacyJavaScript = false;
  