#include <list>
#include <iterator>

struct non_assignable {
    non_assignable() {}
    non_assignable(non_assignable const&) {}
private:
    non_assignable& operator=(non_assignable const&);
};

int main() {
    std::list<non_assignable> x;
    std::fill_n(std::back_inserter(x), 1, non_assignable());
}