[Matumio]

I'm not ready to go back to C++ for this, but I know exactly what you're talking about regarding polymorphism. It's all magic and fairy dust for me, I'm really enjoying Rust. But once you want a dyn trait instead of a simple function, suddenly half of the magic doesn't work any more, and the language explodes into all riddles. (Interesting ones, I admit, and often there is some valuable insight at the end. But still a distraction.)

I guess as C++ veterans, we have to re-learn which approaches will work straight-forward, and which are the ones are asking for trouble. (I eventually found decent solutions for my problems that, while not the ones I had in mind initially, didn't require solving any hard puzzles.)