Exhaustive pattern matching for variants and poly variants.

[amiralies]

recording.mp4

Example from scala. I'm not sure how this should be done. scala has advantage of match keyworkd coming after target expression so can decide to show that snippet based on that. can we do this with opening brace?
for example

type user = Owner | Admin | User

let isSuperUser = (user: user) => switch user { // show snippet

[cristianoc]

We have some templates in the extension.
@chenglou would templates give that ^ behaviour?

[amiralies]

I don't think if those snippets now about type extensions. it should be done in analysis binary

[cristianoc]

For poly variants, see suggestions in #283.

[zth]

This would be very cool to have at least some version of. We don't have the "luxury" of Scala obviously in the order of the keywords/identifier, but maybe we can figure something out anyway.