How to execute TIScript callback from Rust?

[GirkovArpa]

view.foo("foo", function(result) {
    stdout.println("result:", result);
  });

impl EventHandler {
	fn foo(&self, filename: String, callback: sciter::Value) -> sciter::Value {
        image_magick_test();
        callback.call(None, &make_args!(1, "2", 3.0), Some(file!())).unwrap();
		sciter::Value::from(bar(filename.as_str()))
	}
}
impl sciter::EventHandler for EventHandler {
	dispatch_script_call! (
		fn foo(String, sciter::Value);
	);
}
fn bar(filename: &str) -> &str {
    return filename;
}

When I do cargo run, I get an error at fn foo(String, sciter::Value) saying that "no rules expected this token in macro call" (referring to sciter::Value).

[GirkovArpa]

I know it's not a minimal reproducible example, but if it's unclear I can simplify it further.

[GirkovArpa]

I found an example at rust-sciter/examples/threads.rs.