static_init 1.0.3

Safe mutable static and non const static initialization, and code execution at program startup/exit.
Documentation 
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// Copyright 2021 Olivier Kannengieser
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

#[cfg(debug_mode)]
mod test {
    use static_init::{constructor, dynamic};

    #[dynamic(0)]
    static mut V0: i32 = 12;

    #[dynamic(10)]
    static mut V1: i32 = unsafe { *V0 };

    fn panic_hook(p: &core::panic::PanicInfo<'_>) -> () {
        println!("Panic caught {}", p);
        std::process::exit(0)
    }

    #[constructor(200)]
    extern "C" fn set_hook() {
        std::panic::set_hook(Box::new(panic_hook));
    }
}

fn panic_hook(p: &core::panic::PanicInfo<'_>) -> () {
    println!("Panic caught {}", p);
    std::process::exit(1)
}

#[test]
fn bad_init_order() {
    std::panic::set_hook(Box::new(panic_hook));
    assert!(!cfg!(debug_mode));
}