you can also use this to prove that a block of code won't panic (only works when panics unwind): play.rust-lang.org?version=stab...
play.rust-lang.org
Rust Playground
A browser interface to the Rust compiler to experiment with the language
i like emails: finch@plaidfinch.net age123456789pqc3kgk33jrca6vqlf7pl8me3vqzjqj7jf60qdm9l42sm5ffva λ □ · ν ○ · □ ◇ Δ ○﹕□ ( □ ○ → ○ ) → □ ○