I ran into some assertion failures to do with refs while working on an OpenPlanet plugin. (original issue: https://github.com/openplanet-nl/issues/issues/241)

I was trying a hacky way to pass arbitrary data via ref to a coroutine: cast<ref>({cast<ref>(layer), cast<ref>({pageName})}).

This produced the following assertion failures:

I got a compile error after that, and could continue on as normal.
The compile error was No conversion from '<unrecognized token>' to ‘ref’ available. (See the github issue linked above for a little more details/context.)

My next iteration was this, and worked:

ref@[] ud;
ud.InsertLast(layer);
ud.InsertLast(array<string> = {pageName});
CtrlButton("Copy ML", OnClickCopyML, ud);

Thanks, much appreciated!