No error anymore…

add.rs

llvm!(extern {
    fn add(a:i8, b:i8) -> i8 {
        "%result = add i8 %arg0, %arg1
         ret i8 %result"
    }
})

#[fixed_stack_segment]
fn main() {
    printfln!("Sum 2 + 8 is: %?", unsafe { add(2, 8) });
}