rust/tests/ui/extern-flag/auxiliary/panic_handler.rs

#![feature(lang_items, panic_unwind)]
#![no_std]

// Since the `unwind` crate is a dependency of the `std` crate, and we have
// `#![no_std]`, the unwinder is not included in the link command by default.
// We need to include crate `unwind` manually.
extern crate unwind;

#[panic_handler]
pub fn begin_panic_handler(_info: &core::panic::PanicInfo<'_>) -> ! {
    loop {}
}

#[lang = "eh_personality"]
extern "C" fn eh_personality() {}