code: private synchronized void ensureNonPatternSetsReady() {
          if (!areNonPatternSetsReady) {
              includePatterns = fillNonPatternSet(includeNonPatterns, includes);
              excludePatterns = fillNonPatternSet(excludeNonPatterns, excludes);
              areNonPatternSetsReady = true;
          }
      }
docs: Ensure that the in|exclude &quot;patterns&quot;
  have been properly divided up.
  
  @since Ant 1.6.3