docs: public ClassInfoList getClassesWithMethodAnnotation(final String methodAnnotationName) {
          if (closed.get()) {
              throw new IllegalArgumentException("Cannot use a ScanResult after it has been closed");
          }
          if (!scanSpec.enableClassInfo || !scanSpec.enableMethodInfo || !scanSpec.enableAnnotationInfo) {
              throw new IllegalArgumentException("Please call ClassGraph#enableClassInfo(), #enableMethodInfo(), "
                      + "and #enableAnnotationInfo() before #scan()");
          }
          final ClassInfo classInfo = classNameToClassInfo.get(methodAnnotationName);
          return classInfo == null ? ClassInfoList.EMPTY_LIST : classInfo.getClassesWithMethodAnnotation();
      }