That's a pretty fundamental thing to understand about the platform you're using, isn't it? You learn it once, and then you never have to learn it again. Plus,

That's a pretty fundamental thing to understand about the platform you're using, isn't it? You learn it once, and then you never have to learn it again. Plus, it's not entirely clear in your example what happens if "something else" occurs, and then while `do_y()` is being executed, a button press occurs. Is the button press event buffered, or is it dropped? Also, given that you're proposing automatic transformation of programs (by the compiler?), and your `while` loop would become shorthand for some unspecified other program, there would potentially be a lot of hidden magic to be aware of. Your program could even be transformed into a program which would process the events in multiple threads.