blog_os/src/main.rs

#![feature(panic_implementation)] // required for defining the panic handler
#![no_std] // don't link the Rust standard library
#![cfg_attr(not(test), no_main)] // disable all Rust-level entry points
#![cfg_attr(test, allow(dead_code, unused_macros, unused_imports))]

#[macro_use]
extern crate blog_os;

use core::panic::PanicInfo;

/// This function is the entry point, since the linker looks for a function
/// named `_start_` by default.
#[cfg(not(test))]
#[no_mangle] // don't mangle the name of this function
pub extern "C" fn _start() -> ! {
    println!("Hello World{}", "!");

    loop {}
}

/// This function is called on panic.
#[cfg(not(test))]
#[panic_implementation]
#[no_mangle]
pub fn panic(info: &PanicInfo) -> ! {
    println!("{}", info);
    loop {}
}