Final enum classes in C++11

I am just curious whether an enum class can be final or not ... since the compilers are giving me contradictory results.

Consider the code:

#include <iostream>

enum class some_enums final : char
{
    a = 'a', 
    b = 'b',
    c = 'c'
};

int main()
{
    some_enums aa = some_enums::a;
    std::cout << "aa=" << static_cast<char>(aa) << std::endl;
}

Compiling this with Visual Studio 2015 compiler (http://ift.tt/28Tayem) works... however compiling it with clang (http://ift.tt/2bynScT) gives me an error:

source_file.cpp:3:30: error: expected ';' after top level declarator
        enum class some_enums final : char

I have seen no traces of final enum classes anywhere in the standard so I give credit to clang ... however why does Visual Studio accept it in this case although it is not mentioned in MSDN (http://ift.tt/2byCMLn) ?