[util/string] remove TRetVal protocol for TInputRangeAdaptor; [part 4];
@@ -48,7 +48,6 @@ namespace NPrivate {
template <class It>
struct TStlIteratorFace: public It, public TInputRangeAdaptor<TStlIteratorFace<It>> {
- using TRetVal = decltype(std::declval<It>().Next());
using TStrBuf = decltype(std::declval<It>().Next()->Token());
template <typename... Args>
