#![feature(lang_items, start)] #![no_std] #[start] #[cfg(not(feature = "std"))] fn start(_argc: isize, _argv: *const *const u8) -> isize { 0 } #[lang = "eh_personality"] #[no_mangle] #[cfg(not(feature = "std"))] pub extern "C" fn rust_eh_personality() {} #[panic_handler] #[cfg(not(feature = "std"))] fn panic(_info: &core::panic::PanicInfo) -> ! { unsafe { libc::abort(); } } #[cfg(feature = "std")] fn main() {} use displaydoc::Display; /// this type is pretty swell #[derive(Display)] struct FakeType; static_assertions::assert_impl_all!(FakeType: core::fmt::Display);