Verse compiler bug

General Issues and Bug Reporting
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Summary

Unexpected session crash when running verse code with advanced parametric types, without compiler or runtime errors

Please select what you are reporting on:

Verse

What Type of Bug are you experiencing?

Verse

Steps to Reproduce

I am trying to make my own custom event wrapper that suppports custom arguments fully, here is the code:

    #Subscribe with custom argument
    SubscribeWithArg<public>(Listenable : listenable(arg1), OutFun : tuple(arg1, arg2) -> void, Extra : arg2 where arg1:type, arg2 : type) : cancelable =
        Wrapper := with_arg_wrapper(arg1, arg2):
            Extra := Extra,
            OutFun := OutFun

        Listenable.Subscribe(Wrapper.InputFun)
        
    with_arg_wrapper<public>(arg1 : type, arg2 : type) := class<public>:
        Extra<public> : arg2
        OutFun<public> : tuple(arg1, arg2) -> void
        InputFun<public>(Arg1 : arg1) : void =  OutFun(Arg1, Extra)

Usage:

SubscribeWithArg(EProp.Button.InteractedWithEvent, OnPurchase, ())

And here is my event wrapper:

    PrintAgent<localizes>(a : agent) : message = "Agent: {a}"

    OnPurchase(Agent : agent, Data : tuple()) : void =
        Print(PrintAgent(Agent))

Expected Result

Im not sure if im using parametric types correctly, but im expecting to get a print with player’s name when i use the button

Note: The one using the button is me, a real player, not a npc, animal etc

Observed Result

My whole verse session crashes, no compile errors, no runtime errors in uefn, just complete session crash without any reasoning

Overall, this custom event wrapper doesnt work, the second argument works perectly fine, but the first argument, e.g. agent, doesn’t, i cannot convert it to a player nor print it

Platform(s)

Windows 11 pro on both uefn and fortnite client

Additional Notes

There aren’t any npcs, animals, test players etc in my map, every action is made by a real player