Rollup merge of #87428 - GuillaumeGomez:union-highlighting, r=notriddle

Fix union keyword highlighting in rustdoc HTML sources

I followed this logic: if I find an ident "union", I check if it followed by another ident or not. If it's the case, then I consider this is a keyword because it's declaring a union type.

To do so I created a new Iterator which allows to peek the next items without moving the current iterator position.

This is part of https://github.com/rust-lang/rust/issues/85016. If the fix makes sense, I'll extend it to other weak keywords (the issue only mentions they exist but https://doc.rust-lang.org/nightly/reference/keywords.html#weak-keywords only talks about `dyn` and `'static` so not sure if there is anything else to be done?).

cc `@notriddle` (you're one of the last ones who worked on this part of rustdoc so here you go :wink: )
r? `@jyn514`

0 files changed, 0 insertions, 0 deletions