[josefx]

Sys exit does not crash. It raises a SystemExit exception, which can be caught on any layer above it. Given that python uses exceptions for trivial things like loop termination this can be considered normal flow control.

[bccdee]

Yeah, and in Rust you can catch the panic from `unwrap()` with panic::catch_unwind. You just don't, for the same reason you don't catch SystemExits. If a SystemExit is being thrown, it's because you want to crash; if you don't wan to crash, don't throw a SystemExit.

[Measter]

And, by default, panicking in Rust also doesn't crash, it begins a stack unwind which can be caught on any layer above it with catch_unwind.