How to catch a panic?

Question

I need to catch a panic so that it doesn't exit the the program. For example, how to catch a panic here and print "Hello, World"?:

fn main() {
    let v = vec![1, 2, 3];

    v[99];
    println!("Hello, World");
}

Answer 1

You can use std::panic::catch_unwind to, well, catch unwinding panics, but do make sure to read the documentation first:

fn main() {
    let v = vec![1, 2, 3];
    let panics = std::panic::catch_unwind(|| v[99]).is_err();
    assert!(panics);
    println!("Hello, World");
}