Using lambda captured constexpr value as an array dimension

GCC and Clang do compile the following code:

void Test()
{
   constexpr int Size = 3;
   auto Lambda = [Size]{ int Dim[Size]; };
}

However, VisualStudio 2015 CTP 6 does not. Nevertheless, all 3 compilers are happy with this code:

void Test()
{
   static constexpr int Size = 3;
   auto Lambda = []{ int Dim[Size]; };
}

Which snippet is actually doing it in the correct way? What does the C++ standard say?