Function catch_panic 

pub fn catch_panic<R>(body: impl FnOnce() -> R + UnwindSafe) -> Result<R, Panic>

Runs provided closure and captures panic if one happens, along with its backtrace

Limitations

Stable API doesn’t allow to detect from panic hook that panic being handled will unwind. So if you get unwindable panic, panic info will be swallowed. This will be fixed when #92988 stabilizes. Correct API is used on nightly builds, which resolves issue.

Panic modes

In case crate is compiled in panic mode other than panic=unwind, hook will unconditionally forward execution to previously installed hook. In case of panic there will be no unwind, so client code will not get panic info anyway, although we set hook anyway in case there are nested scoped hooks, to preserve local behavior.

Parameters

• body - closure which should be run with capturing panics. The closure has same requirements as the parameter to std::panic::catch_unwind. In particular, if you want to assert that closure is unwind safe when type system can’t deduce it, you can use std::panic::AssertUnwindSafe. See std::panic::catch_unwind for details.

Returns

• Ok(result) - with body1’s return value if it completes without panic
• Err(panic) - if body panics in process, with Panic as error value