@NotNull
  SortedSet<ChainOpAndOccurrences<MethodCall>> findMethodReferenceOccurrences(@NotNull String rawReturnType,
                                                                              @SignatureData.IteratorKind byte iteratorKind,
                                                                              @NotNull ChainCompletionContext context)
    throws ReferenceIndexUnavailableException;
@NotNull
  SortedSet<ChainOpAndOccurrences<MethodCall>> findMethodReferenceOccurrences(@NotNull String rawReturnType,
                                                                              @SignatureData.IteratorKind byte iteratorKind,
                                                                              @NotNull ChainCompletionContext context)