Remove debug function

src/main.rs

@@ -27,16 +27,10 @@ fn showit<T: Display>(x: &mut T) -> () {
     println!("{}", x)
 }
 
-fn greet() {
-    println!("hello!");
-}
-
 fn main() {
     for fname in env::args().skip(1) {
         let mut engine = Engine::new();
 
-        &(greet as fn()->()).register(&mut engine, "greet");
-
         &(showit as fn(x: &mut i32)->()).register(&mut engine, "print");
         &(showit as fn(x: &mut i64)->()).register(&mut engine, "print");
         &(showit as fn(x: &mut u32)->()).register(&mut engine, "print");