[Bug c++/71954] template partial specialization for constexpr error

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71954

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-07-22
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |5.3.0, 6.1.0, 7.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with 5.1.0, 6.1.0, and current trunk (7.0).  Clang 3.8 end EDG eccp
4.11 both successfully compile the code.  Rewriting it in terms of structs
instead of variable templates works:

template <typename...T>
struct Str2
{
    template <typename...T1>
    struct Helper2 { enum { v = true}; };

    template <typename T2, typename...T3>
    struct Helper2<Container<T2>, T3...> { enum { v = false }; };

    static_assert(Helper2<T...>::v, "Check");
};

Str2<int, int, int> s;