private static @Nullable SerializedStubTree findPrebuiltSerializedStubTree(@NotNull FileContent fileContent) {
    PrebuiltStubsProvider prebuiltStubsProvider = PREBUILT_STUBS_PROVIDER_EP.forFileType(fileContent.getFileType());
    if (prebuiltStubsProvider == null) {
      return null;
    }
    return prebuiltStubsProvider.findStub(fileContent);
  }
private static @Nullable SerializedStubTree findPrebuiltSerializedStubTree(@NotNull FileContent fileContent)