rustdoc: fold fields for enum struct variants into a docblock #37728
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Per discussion in #37500, this PR updates the enum rendering code to wrap variants with named struct fields in a
docblock
span that is hidden automatically upon load of the page. This gives struct variant fields a clean separation from other enum variants, giving a boost to the readability of such documentation. Preview output is available on the issue page, but for the sake of completeness I'll include the images here again.When you initially load the page, there's a line under variants with struct fields letting you know you can click to expand the listing.
If you click to expand, the header and table unfold into a nicely-indented listing.
If you want to take a look in your own browser and screen size, I've got this version hosted on my server.
Fixes #37500
r? @GuillaumeGomez