Refine examples.

examples/arrays_and_structs.rs

@@ -1,38 +1,40 @@
 use rhai::{Engine, RegisterFn, INT};
 
-#[derive(Clone, Debug)]
+#[derive(Debug, Clone)]
 struct TestStruct {
     x: INT,
 }
 
 impl TestStruct {
-    fn update(&mut self) {
+    pub fn update(&mut self) {
         self.x += 1000;
     }
 
-    fn new() -> Self {
+    pub fn new() -> Self {
         Self { x: 1 }
     }
 }
 
 #[cfg(not(feature = "no_index"))]
 #[cfg(not(feature = "no_object"))]
-fn main() {
+fn main() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();
 
     engine
         .register_type::<TestStruct>()
-        .register_fn("update", TestStruct::update)
-        .register_fn("new_ts", TestStruct::new);
+        .register_fn("new_ts", TestStruct::new)
+        .register_fn("update", TestStruct::update);
 
     println!(
         "{:?}",
-        engine.eval::<TestStruct>("let x = new_ts(); x.update(); x")
+        engine.eval::<TestStruct>("let x = new_ts(); x.update(); x")?
     );
     println!(
         "{:?}",
-        engine.eval::<TestStruct>("let x = [new_ts()]; x[0].update(); x[0]")
+        engine.eval::<TestStruct>("let x = [new_ts()]; x[0].update(); x[0]")?
     );
+
+    Ok(())
 }
 
 #[cfg(any(feature = "no_index", feature = "no_object"))]