static_init 1.0.4

Safe mutable static and non const static initialization, and code execution at program startup/exit.
Documentation 
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#![allow(static_mut_refs)]
// 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_attr(feature = "thread_local", feature(thread_local))]

#[cfg(all(feature = "thread_local", debug_mode))]
mod test {
    use static_init::{constructor, dynamic, CyclicPanic};

    #[thread_local]
    #[dynamic(lazy)]
    static V0: i32 = *V0;

    fn panic_hook(p: &std::panic::PanicHookInfo<'_>) -> () {
        if p.payload().is::<CyclicPanic>() {
            println!("Cyclic Panic running");
        } else {
            println!("Panic expectedly caught {:?}", p);
            std::process::exit(0)
        }
    }

    #[constructor(5)]
    extern "C" fn touch() {
        &*V0;
    }

    #[constructor(10)]
    extern "C" fn set_hook() {
        std::panic::set_hook(Box::new(panic_hook));
    }
}

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

#[test]
fn bad_cyclic_thread_local_lazy() {
    std::panic::set_hook(Box::new(panic_hook));
    assert!(!cfg!(all(debug_mode, feature = "test_thread_local")));
}