consider the following:

auto b = std::make_unique<int>(12345);

b is now an unique_ptr<int>, pointing to a single int* with a valid of 12345.

makeUnique<int>(12345>

gives the error:
```
/Users/jyavenard/Work/webkit/OpenSource/WebKitBuild/Debug/usr/local/include/wtf/StdLibExtras.h:595:41: error: type 'int' cannot be used prior to '::' because it has no members
    static_assert(std::is_same<typename T::webkitFastMalloced, int>::value, "T is FastMalloced");
                                        ^
/Users/jyavenard/Work/webkit/OpenSource/Tools/TestWebKitAPI/Tests/WebCore/MediaPromise.cpp:524:17: note: in instantiation of function template specialization 'WTF::makeUnique<int, int>' requested here
    auto test = makeUnique<int>(12345);
 ```