Исправление Lrrr, (текущая версия) :
так написано на cppreference:
If the underlying type is not fixed and the source value is out of range, the result is unspecified (until C++17) undefined (since C++17)
и кстати -fsanitize=undefined в clang это ловит.
Исходная версия Lrrr, :
так написано на cppreference:
If the underlying type is not fixed and the source value is out of range, the result is unspecified (until C++17) undefined (since C++17)