@NotNull
  Collection<? extends @NotNull PsiSymbolReference> getExternalReferences(@NotNull PsiExternalReferenceHost host,
                                                                          @NotNull PsiSymbolReferenceHints hints);
@NotNull
  Collection<? extends @NotNull PsiSymbolReference> getExternalReferences(@NotNull PsiExternalReferenceHost host,
                                                                          @NotNull PsiSymbolReferenceHints hints)