Why is panic code inlined?

14

Would something like this works?

panic!("{} - {named:?} - {:?} - {other}", 0, named = return 42, 1, other = 2);
// converted into
{
    #[inline(never)]
    #[cold]
    fn panic(
        __arg1: impl ::core::fmt::Display,
        named: impl ::core::fmt::Debug,
        __arg2: impl ::core::fmt::Debug,
        other: impl ::core::fmt::Display
    ) -> ! {
        ::core::panicking::panic_fmt(
            format_args!("{} - {named:?} - {:?} - {other}", __arg1, named = named, __arg2, other = other)
        );
    }
    panic(0, return 42, 1, 2);
}

EDIT: Ok, it seems that's more or less what someone tried to do in #115562, but also taking constness in account. So I guess we just need to wait #115562 to be resolved.