rhai 0.20.3

Embedded scripting for Rust
Documentation 
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#![cfg(not(feature = "no_function"))]
use rhai::{Engine, EvalAltResult, FnNamespace, Module, Shared, INT};

#[cfg(not(feature = "no_object"))]
#[test]
fn test_functions_trait_object() -> Result<(), Box<EvalAltResult>> {
    trait TestTrait {
        fn greet(&self) -> INT;
    }

    #[derive(Debug, Clone)]
    struct ABC(INT);

    impl TestTrait for ABC {
        fn greet(&self) -> INT {
            self.0
        }
    }

    #[cfg(not(feature = "sync"))]
    type MySharedTestTrait = Shared<dyn TestTrait>;

    #[cfg(feature = "sync")]
    type MySharedTestTrait = Shared<dyn TestTrait + Send + Sync>;

    let mut engine = Engine::new();

    engine
        .register_type_with_name::<MySharedTestTrait>("MySharedTestTrait")
        .register_fn("new_ts", || Shared::new(ABC(42)) as MySharedTestTrait)
        .register_fn("greet", |x: MySharedTestTrait| x.greet());

    assert_eq!(
        engine.eval::<String>("type_of(new_ts())")?,
        "MySharedTestTrait"
    );
    assert_eq!(engine.eval::<INT>("let x = new_ts(); greet(x)")?, 42);

    Ok(())
}

#[test]
fn test_functions_namespaces() -> Result<(), Box<EvalAltResult>> {
    let mut engine = Engine::new();

    #[cfg(not(feature = "no_module"))]
    {
        let mut m = Module::new();
        let hash = m.set_native_fn("test", || Ok(999 as INT));
        m.update_fn_namespace(hash, FnNamespace::Global);

        engine.register_static_module("hello", m.into());

        assert_eq!(engine.eval::<INT>("test()")?, 999);

        #[cfg(not(feature = "no_function"))]
        assert_eq!(engine.eval::<INT>("fn test() { 123 } test()")?, 123);
    }

    engine.register_fn("test", || 42 as INT);

    assert_eq!(engine.eval::<INT>("test()")?, 42);

    #[cfg(not(feature = "no_function"))]
    {
        assert_eq!(engine.eval::<INT>("fn test() { 123 } test()")?, 123);

        assert_eq!(
            engine.eval::<INT>(
                "
                    const ANSWER = 42;

                    fn foo() { global::ANSWER }
                    
                    foo()
                "
            )?,
            42
        );
    }

    Ok(())
}