[llvm-bugs] [Bug 50561] New: Concepts overload check not considered?

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50561

            Bug ID: 50561
           Summary: Concepts overload check not considered?
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: erich.keane at intel.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

I'm not sure whose bug this is, my concepts aren't particularly great yet,
but...

https://godbolt.org/z/acK51xve3

template <typename a> 
concept bd = a::c;

template <typename, typename as, typename... be> 
void bf(as, be...);

template <bd a, typename as> 
void bf(as) { 
   using bg = typename a::second_type; 
}

template <typename, typename> class vector {
    static constexpr bool c = false; // #1
};

void b() {
  bf<vector<int, int>>(0); 
}


GCC selects the 1st overload of 'bf', clang chooses the 2nd overload.  Neither
compiler seems to consider the line on #1. It can be 'true' 'false' or not
existent.

It seems to me that the concept 'bd' should NOT match vector if 'c' is false or
non-existent, so I would expect it to choose the 1st overload.

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