Rust try/catch

main.rs

#![allow(clippy::needless_return)]

macro_rules! throw {
    ($expr:expr) => {
        panic!($expr)
    };
}

macro_rules! try_catch {
    (try $try_block:block catch ($err:ident) $catch_block:block) => {
        match std::panic::catch_unwind(|| $try_block) {
            Err(e) => {
                if let Some($err) = e.downcast_ref::<&str>() {
                    $catch_block
                } else {
                    unreachable!();
                }
            }
            Ok(v) => v,
        }
    };
}

fn divide(x: u32, y: u32) -> u32 {
    if y == 0 {
        throw!("y cannot be zero");
    }
    return x / y;
}

fn main() {
    try_catch! {
        try {
            let huh = divide(10, 0);
            println!("{}", huh);
        } catch (e) {
            println!("Error : {:?}", e);
        }
    };
}