ruwren 0.4.10

Rusty bindings to Wren programming language
Documentation 
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use ruwren::{
    create_module, get_slot_checked, send_foreign, Class, FunctionSignature, ModuleLibrary,
    VMConfig, VM,
};

struct BoxxWrapper(Box<dyn Boxx>);

impl Class for BoxxWrapper {
    fn initialize(_: &VM) -> BoxxWrapper {
        unreachable!()
    }
}

impl BoxxWrapper {
    fn flipp(&self, vm: &VM) {
        vm.set_slot_double(0, self.0.flipp() as f64);
    }
}

trait Boxx {
    fn flipp(&self) -> u32;
}

impl Class for Box<dyn Boxx> {
    fn initialize(_: &VM) -> Self {
        panic!("Can't initialize DynBoxx")
    }
}

#[derive(Clone)]
struct Bonafide {
    x: u32,
    y: u32,
}

impl Class for Bonafide {
    fn initialize(vm: &VM) -> Bonafide {
        let x = get_slot_checked!(vm => num 1) as u32;
        let y = get_slot_checked!(vm => num 2) as u32;
        Bonafide { x, y }
    }
}

impl Bonafide {
    fn send_box(&self, vm: &VM) {
        send_foreign!(vm, "boxed", "DynBoxx", Box::new(self.clone()) as Box<dyn Boxx> => 0);
    }

    fn send_wrapped(&self, vm: &VM) {
        send_foreign!(vm, "boxed", "DynBoxxWrapped", BoxxWrapper(Box::new(self.clone())) => 0);
    }
}

impl Boxx for Bonafide {
    fn flipp(&self) -> u32 {
        self.x + self.y
    }
}

create_module! {
  class("Bonafide") crate::Bonafide => bonafide {
    instance(getter "box") send_box,
    instance(getter "wrap") send_wrapped
  }

  class("DynBoxx") Box<dyn crate::Boxx> => boxx {
  }

  class("DynBoxxWrapped") crate::BoxxWrapper => boxxwrap {
    instance(getter "flipp") flipp
  }

  module => boxed
}

const BONAFIDE_MODULE_SRC: &str = include_str!("boxed/bonafide.wren");

fn main() {
    let mut lib = ModuleLibrary::new();
    boxed::publish_module(&mut lib);
    let vm = VMConfig::new().library(&lib).build();
    vm.interpret("boxed", BONAFIDE_MODULE_SRC).unwrap(); // Should succeed

    let res = vm.interpret("main", include_str!("boxed/main.wren"));
    if let Err(err) = res {
        eprintln!("Load error: {}", err);
        return;
    }

    vm.execute(|vm| {
        vm.get_variable("main", "BoxedTest", 0);
    });

    let res = vm.call(FunctionSignature::new_getter("main"));

    if let Err(err) = res {
        eprintln!("{}", err);
    } else {
        vm.execute(|vm| {
            let f = get_slot_checked!(vm => foreign Box<dyn crate::Boxx> => 0);
            println!("boxed> {}", f.flipp());
        })
    }
}