Suppress panic output in Rust when using panic::catch_unwind

You need to register a panic hook with std::panic::set_hook that does nothing. You can then catch it with std::panic::catch_unwind:

use std::panic;

fn main() {
    panic::set_hook(Box::new(|_info| {
        // do nothing
    }));

    let result = panic::catch_unwind(|| {
        panic!("test panic");
    });

    match result {
        Ok(res) => res,
        Err(_) => println!("caught panic!"),
    }
}

As Matthieu M. notes, you can get the current hook with std::panic::take_hook in order to restore it afterwards, if you need to.

See also:

• Redirect panics to a specified buffer

Use following catch_unwind_silent instead of regular catch_unwind to achieve silence for expected exceptions:

use std::panic;

fn catch_unwind_silent<F: FnOnce() -> R + panic::UnwindSafe, R>(f: F) -> std::thread::Result<R> {
    let prev_hook = panic::take_hook();
    panic::set_hook(Box::new(|_| {}));
    let result = panic::catch_unwind(f);
    panic::set_hook(prev_hook);
    result
}