RequireArgumentName - FS-1095 (experimental branch)

[smoothdeveloper]

This is my experimental branch for https://github.com/fsharp/fslang-design/blob/master/drafts/FS-1095-requirenamedargumentattribute.md.

Mostly to get feedback from CI, and maybe getting patches & reviews along the line.

[NinoFloris]

I do like this as an optional thing!

[smoothdeveloper]

@cartermp, can you confirm this one also goes behind language version flag and should ship in preview?

What is the bar for using language version guards?

If that process is solidified, it would be good to describe it in the README.md of fslang-design repository.

[psfinaki]

Hey @smoothdeveloper, this PR has a frightening number of conflicts - do you still want to continue working on this?
If so, we might want to set up a small meeting with a few F# devs to decide what to do here as this seems like quite a big thing.

[vzarytovskii]

What is the bar for using language version guards?

I'm slightly late to the party, usually all breaking changes (often, even if they are fixes) go under the language flag, and I think that all new features should too. If we don't, it defeats the whole purpose of language versions.

Ideally subset of features for specific language version should not change with time, so people will be sure that by using specific version they'll get specific behaviour.

can you confirm this one also goes behind language version flag and should ship in preview?

So, I would say - yes.

[KevinRansom]

@smoothdeveloper , hey mate,
Thanks for this contribution it looks as though it has hit a bump, and so, I am going to close it, please reopen this if you still want to complete this and get some time to work on it.

Once again thanks

Kevin