make_unique Too Few Arguments in Creator

Question

#include <QCoreApplication>
#include <iostream>
#include <memory>

using namespace std;

class A{
public:
    A(){cout << "ctorA " << endl;}
    ~A(){cout << "dtorA " << endl;}
};

class X{
    A arr[10];
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    { unique_ptr<X> upX = make_unique<X>(); }

    return a.exec();
}

Qt Creator underlines std::make_unique and when I hover over it with mouse, it tells me there are "Too few arguments". Compiles and runs fine. No errors or warnings as far as I can tell. Am I doing something wrong or is this a bug in Creator or something? Newest compiler gcc7.3.something and Qt10.something. Just got it today.