I did it. I managed to get TWO compile errors on one character.

Introducing the quantum symbol.

I have a function throwing an error when passed a vector which has an unexpected size.
When I use the debugger and try to watch said vector for write access, the code which failed at some point just does… things. I have no idea what it is doing instead of failing but it is doing it gladly. It's not even paused, at least for the debugger.

Now I know why they said C++ is challenging to debug.