[elbear]

I never said Rust makes guarantees that code is panic-free. I said that Rust provides more safety guarantees than C. The Result type is one of them because you have to handle the error case explicitly. If you don't use unwrap.

Also, when I say safety guarantees, I'm not talking about safe rust. I'm talking about Rust features that prevent bugs, like the borrow checker, types like Result and many others.

[josephg]

Ah thanks for the clarification. That wasn’t clear to me reading your comment.

You’re right that rust forces you to explicitly decide what to do with Result::Err. But that’s exactly what we see here. .unwrap() is handling the error case explicitly. It says “if this is an error, crash the program. Otherwise give me the value”. It’s a very useful function that was used correctly here. And it functioned correctly by crashing the program.

I don’t see the problem in this code, beyond it not giving a good error message as it crashed. As the old joke goes, “Task failed successfully.”