Failing With Style

It may seem weird that this None propagation thing is considered so important in Rust that it gets its own special ? thingy. But here’s the next piece in the puzzle: ? works for more than just Option. A very common thing to do in real world programmers is to deal with errors. Let’s get a nice example to make sense of that.

Let’s say I’m running the ticket booth for a roller coaster. Families come up, and I need to ...