docs: public final void save(String dirName, String className, String methodName, Set<RegData> regData) {
          // @Research(if statement).
          if (!Config.X_DEPENDENCIES_SAVE_V) {
              return;
          }
          // Ensure that the directory for coverage exists.
          new File(dirName).mkdir();
          String fullName = className + '.' + methodName;
          save(openFileWrite(dirName, fullName, className, methodName), regData);
      }