constexpr not compiling in VC2013

This constexpr code does not compiled in Visual Studio 2013 version 12.0.21005.1 REL Is there a newer Visual Studio compiler that works with constexpr? ``` #include <iostream> constexpr int factorial(int n) { return n <= 1 ? 1 : (n * factorial(n - 1)); } int main(void) { const int fact_three = factorial(3); std::cout << fact_three << std::endl; return 0; } ``` output from compilation: ``` 1>------ Build started: Project: Project1, Configuration: Debug Win32 ------ 1> Source.cpp 1>....\source.cpp(3): error C2144: syntax error : 'int' should be preceded by ';' 1>....\source.cpp(3): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== ``` Herb Sutter mentions constexpr on his blog but is unclear in what version it works / will work? http://herbsutter.com/2013/09/09/visual-studio-2013-rc-is-now-available/#comment-13521