private static boolean containsNullable(List<? extends AnnotationMirror> annotations) {
    return annotations.stream()
        .map(a -> a.getAnnotationType().asElement().getSimpleName())
        .anyMatch(n -> n.contentEquals("Nullable"));
  }
True if one of the given annotations is {@code @Nullable} in any package.
value/src/main/java/com/google/auto/value/extension/memoized/processor/MemoizeExtension.java