void func(int&&) noexcept {
}

int main() {
   int x = 10;
   func(x); // error: cannot bind 'int' lvalue to 'int&&' 
}

// template< class T >
// typename std::remove_reference<T>::type&& move( T&& t ) noexcept;
int main() {
   int x = 10;
   std::move(x); // OK
}