DocumentHightlightKind for function exits

[kjeremy]

Over at rust-lang/rust-analyzer#4691 there's some discussion (and a screenshot) about highlighting function exit points when the cursor is on the return type in a function signature or on an exit point. It would be nice to be able to extend DocumentHighlightKind to support this.

[dbaeumer]

@jrieken Did this come up in VS Code API?

[jrieken]

Nope - didn't come up so far but I know that TS supports this, just with a "normal" colour.

BTW TypeScript also support highlights for async/await. So, following the special kind request that would be another case

[dbaeumer]

Cool.