Add timestamp support.

tests/string.rs

@@ -24,6 +24,7 @@ fn test_string() -> Result<(), EvalAltResult> {
     assert_eq!(engine.eval::<String>(r#""foo" + 123"#)?, "foo123");
 
     #[cfg(not(feature = "no_stdlib"))]
+    #[cfg(not(feature = "no_object"))]
     assert_eq!(engine.eval::<String>("(42).to_string()")?, "42");
 
     #[cfg(not(feature = "no_float"))]

tests/time.rs

@@ -0,0 +1,39 @@
+#![cfg(not(feature = "no_stdlib"))]
+
+use rhai::{Engine, EvalAltResult, INT};
+
+#[cfg(not(feature = "no_float"))]
+use rhai::FLOAT;
+
+#[test]
+fn test_timestamp() -> Result<(), EvalAltResult> {
+    let engine = Engine::new();
+
+    assert_eq!(engine.eval::<String>("type_of(timestamp())")?, "timestamp");
+
+    #[cfg(not(feature = "no_float"))]
+    assert!(
+        engine.eval::<FLOAT>(
+            r#"
+                let time = timestamp();
+                let x = 10_000;
+                while x > 0 { x -= 1; }
+                elapsed(time)
+    "#
+        )? < 10.0
+    );
+
+    #[cfg(feature = "no_float")]
+    assert!(
+        engine.eval::<INT>(
+            r#"
+                let time = timestamp();
+                let x = 10_000;
+                while x > 0 { x -= 1; }
+                elapsed(time)
+    "#
+        )? < 10
+    );
+
+    Ok(())
+}