https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113841
--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This one's much harder to fix:
#include <string>
template<typename T>
struct Alloc
{
using value_type = T;
Alloc(int) { }
template<typename U> Alloc(const Alloc<U>&) { }
T* allocate(std::size_t n) { return std::allocator<T>().allocate(n); }
void deallocate(T* p, std::size_t n) { std::allocator<T>().deallocate(p, n);
}
};
template<typename T> struct wrap { T t; };
template<typename T> void do_adl(T&) { }
void test_pr113841()
{
using Tr = std::char_traits<char>;
using test_type = std::basic_string<char, Tr, Alloc<char>>;
std::pair<const int, wrap<test_type>>* h = nullptr;
do_adl(h);
}
