Add support for character constants

examples/arrays_and_structs.rs

@@ -0,0 +1,28 @@
+extern crate rhai;
+use rhai::{Engine, FnRegister};
+
+#[derive(Clone, Debug)]
+struct TestStruct {
+    x: i64
+}
+
+impl TestStruct {
+    fn update(&mut self) {
+        self.x += 1000;
+    }
+
+    fn new() -> TestStruct {
+        TestStruct { x: 1 }
+    }
+}
+
+fn main() {
+    let mut engine = Engine::new();
+
+    engine.register_type::<TestStruct>();
+
+    engine.register_fn("update", TestStruct::update);
+    engine.register_fn("new_ts", TestStruct::new);
+
+    println!("{:?}", engine.eval::<TestStruct>("var x = [new_ts()]; x[0].update(); x[0]"));
+}