#include <vector>
#include <boost/blank.hpp>
#include <boost/variant/variant.hpp>

// If this include is removed, then it compiles.
#include <boost/range/adaptor/filtered.hpp>

struct A {};
struct B {};

void f() {
	// If boost::blank is not used, then it compiles.
	using Variant = boost::variant<boost::blank, A, B>;
	Variant v1;
	std::vector<Variant> vec{A{}, B{}};
}