Sun, 18 Jun 2017 21:31:41 GMT

This code.
#include "boost/xpressive/xpressive.hpp"
int main()
{
	using namespace boost::xpressive;
	auto scheme = (s1 = +_w) >> "://";
	auto host_ipv6 = (s2 = ('[' >> +(xdigit | ':') >> ']'));
	cregex uri_re = scheme >> host_ipv6;
	cmatch m;
	if( regex_match( "http://[fe::]", m, uri_re ) )
	{
		std::string protocol = m[1];
		protocol = protocol;
	}
    return 0;
}

Crashes with access violation to random address. Visual Studio 2015 RELEASE builds only (for both 32/64 bit builds).

Boost C++ Libraries: Ticket #13081: Xpressive crashes in release if auto keyword used.