public Collection<PsiElement> getJetExtensionFunctionsByName(
      @NotNull String name, @NotNull GlobalSearchScope scope) {
    HashSet<PsiElement> functions = new HashSet<PsiElement>();
    functions.addAll(JetExtensionFunctionNameIndex.getInstance().get(name, project, scope));
    functions.addAll(
        JetFromJavaDescriptorHelper.getTopExtensionFunctionPrototypesByName(name, project, scope));

    return functions;
  }