Implement print/debug functions via Dynamic parameters.

tests/print.rs

@@ -1,6 +1,33 @@
-use rhai::{Engine, EvalAltResult, RegisterFn, INT};
+use rhai::{Engine, EvalAltResult, RegisterFn, Scope, INT};
 use std::sync::{Arc, RwLock};
 
+#[cfg(not(feature = "only_i32"))]
+#[cfg(not(feature = "only_i64"))]
+#[test]
+fn test_to_string() -> Result<(), Box<EvalAltResult>> {
+    let engine = Engine::new();
+
+    let mut scope = Scope::new();
+    scope.push("x", 42_u8);
+    scope.push("y", 42_i32);
+    scope.push("z", 42_i16);
+
+    assert_eq!(
+        engine.eval_with_scope::<String>(&mut scope, "x.to_string()")?,
+        "42"
+    );
+    assert_eq!(
+        engine.eval_with_scope::<String>(&mut scope, "y.to_string()")?,
+        "42"
+    );
+    assert_eq!(
+        engine.eval_with_scope::<String>(&mut scope, "z.to_string()")?,
+        "42"
+    );
+
+    Ok(())
+}
+
 #[test]
 fn test_print_debug() -> Result<(), Box<EvalAltResult>> {
     let logbook = Arc::new(RwLock::new(Vec::<String>::new()));