make types::Function callable

src/types.rs

@@ -102,3 +102,9 @@ impl Hash for Function {
 		std::ptr::hash(self.inner.as_ref(), state)
 	}
 }
+
+impl Function {
+	pub fn call(&self, args: &[Value]) -> Value {
+		(self.inner)(args)
+	}
+}