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mod riot_fmt {
    extern { pub fn print(ptr : *const u8, len : usize) -> (); }
    extern { pub fn print_u32_dec(n : u32) -> (); }
    extern { pub fn print_s32_dec(n : i32) -> (); }
    extern { pub fn print_u64_dec(n : u64) -> (); }
}

pub trait Print {
    fn print(self) -> ();
}

pub fn print<T: Print> (x: T) {
    x.print();
}

pub fn printnl() {
    "\n".print();
}

impl<'a> Print for &'a str {
    fn print(self) -> () {
        unsafe { riot_fmt::print(self.as_ptr(), self.len()); }
    }
}

impl Print for u32 {
    fn print(self) -> () {
        unsafe { riot_fmt::print_u32_dec(self); }
    }
}

impl Print for i32 {
    fn print(self) -> () {
        unsafe { riot_fmt::print_s32_dec(self); }
    }
}

impl Print for u64 {
    fn print(self) -> () {
        unsafe { riot_fmt::print_u64_dec(self); }
    }
}