Improved error message for @render containing invalid html

[justingolden21]

Describe the problem

I spent hours debugging from errors about illegal invocation and node type and tried googling and searching svelte docs and found nothing. Below are the errors I got:

Describe the proposed solution

The error should be clear that the html node wrapping the @render call cannot wrap the contents of the @render, eg. a <p> containing a @render containing a <p>. The error messages were not clear at all and me and my friend who have used svelte for years and svelte 5 for months spent a long time debugging to figure this out. A simple, readable error message would have saved us many hours.

Importance

would make my life easier

[dummdidumm]

Please provide a reproduction via a REPL link. I don't know what you did to get this error just from reading the description.