anchor.diff:  
   class DriverOptions {
   
  +  /// The maximum number of sources for which AST structures should be kept
  +  /// in the cache.  The default is 512.
  +  int cacheSize = 512;
  +
     /// The path to the dart SDK.
     String dartSdkPath;
   
  
positive.code: /// Still very much a WIP.
  class AnalysisDriver {
  
    /// The maximum number of sources for which AST structures should be kept
    /// in the cache.
    // TODO: move to DriverOptions
    static const _MAX_CACHE_SIZE = 512;
  
    final DriverOptions _options;
  
    final int _startTime;
  
negative.code:   }
  
    void _setOptions(AnalysisOptionsImpl analysisOptions) {
      analysisOptions.cacheSize = _options.cacheSize;
      analysisOptions.hint = !_options.disableHints;
      analysisOptions.lint = _options.enableLints;
    }
  