How can I make a custom listenable?

[im_a_lama (LAMA)]

Yep I actually posted an issue about this but it didn’t got any attention, I don’t understand how I didn’t get any upvotes, looks like a major issue to me

Parametric classes not usable outside of own file

Please select what you are reporting on: Verse What Type of Bug are you experiencing? Verse Summary Parametric classes not usable outside of own file Steps to Reproduce Make a parametric class, reference it outside the file Expected Result No errors, the class should be called outside the file (it’s not in a module, and even when inside a module, the same error occurs) Observed Result Can’t access a function from a preceding type. (3502) Error only raises once we make a reference to that c…