[gen4] Cannot parameterize a View

[kevinresol]

class Main {
    static function main() {}
}

class MyView<T:EnumValue> extends coconut.ui.View {
    @:attr var data:Data<T>;
    function render() return null;
}

class Data<T:EnumValue> implements coconut.data.Model {}

This gives Type not found : T

Commenting out the attribute results in Invalid number of type parameters for MyView