[clang 16 & trunk][c++20] Crash when mixing iterator concepts, ADL and using-declarations in a requires expression #63808
Description
After drawing some inspiration from this StackOverflow answer, I decided to write up the following code that checks the presence of begin() and end() via ADL:
#include <concepts>
#include <iterator>
#include <vector>
template <typename T>
concept HasBeginEnd = []{
using std::begin;
using std::end;
return requires(T& t)
{
{begin(t)} -> std::input_iterator;
{end(t)} -> std::input_iterator;
};
}();
static_assert(HasBeginEnd<std::vector<int>>);This, however, crashes Clang 16 and trunk on Godbolt. Surprisingly, it appears that Clang 15 and older are not affected.
Godbolt link: https://godbolt.org/z/zndsGP63Y
Stacktrace generated: stacktrace.txt
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