> But at that point you're already halfway to using a different language This statement makes no sense at all. Using a third-party library that's not specified

> But at that point you're already halfway to using a different language This statement makes no sense at all. Using a third-party library that's not specified by the same ISO standard that specifies the core languagr does not create "a different language". It just means you're actually using the programming language to do stuff. This isn't the case even if someone uses a toolkit that relies on preprocessor tricks to give the illusion of extending the core language, such as Qt.