This was quite fun but I do find the UI with multiple overlapping windows a bit confusing and difficult to navigate, particularly when you click on a type definition and open another file. Does anyone know what UI library it's using? I'd prefer to see a list of the files and then be able to go into each one individually, as it is there is a lot more clicking with the mouse than I'd expect with a CLI.
Yes, I wonder what the author is using this for? Perhaps just a proof of concept - it would be hard to use it to browse in its current state, though it does show off linking between different parts of the AST, I think I prefer the html approach taken by godoc and don't mind opening a browser for that.