https://vimeo.com/782643147 sneak peak of the next version of my structural editor. The core AST receieved a fairly big rewrite. (added effect types, made case statements first class). So now the editor needs to be updated to match the new tree.

Regarding

.map

being a field of the list? Is this an oo-style thing?

No, it's just and easy implementation thing. Though I would say first class reference of all this constructs is particularly un oop