In file included from /tmp/tmpvjnf3x0f.cpp:241:0:
include/asserts.h: In instantiation of 'std::ostream& belts::operator<<(std::ostream&, const std::vector<T>&) [with T = std::vector<std::vector<int> >; std::ostream = std::basic_ostream<char>]':
include/asserts.h:68:11:   required from 'belts::StringBuilder&& belts::operator<<(belts::StringBuilder&&, const T&) [with T = std::vector<std::vector<std::vector<int> > >]'
include/asserts.h:82:15:   required from 'void belts::AssertEqual(const T&, const U&, const string&) [with T = std::vector<std::vector<std::vector<int> > >; U = std::vector<std::vector<std::vector<int> > >; std::__cxx11::string = std::__cxx11::basic_string<char>]'
/tmp/tmpvjnf3x0f.cpp:397:72:   required from here
include/asserts.h:19:9: error: no match for 'operator!' (operand type is 'const std::vector<std::vector<int> >')
     if (!first) {
         ^~~~~~
compilation terminated due to -Wfatal-errors.