// Ecstasy does not have any built-in functions. However, there are two keywords
// ("is" and "as") that use a function-like syntax:
module IsAndAs {
    Int|String foo() {
        return "hello";
    }

    void run() {
        @Inject Console console;
        Object o = foo();
        if (o.is(String)) {             // <- looks like a function call
            String s = o.as(String);    // <- looks like a function call
            console.print($"foo returned the string: {s.quoted()}");
        }
    }
}