Add missing instance member parameter code fix

[cartermp]

Adds this 'lil boi

[smoothdeveloper]

Curious, can VS code fixer like this have a menu that would prompt for giving the name in case _ only gets us half way there?

Not a big deal, but could be a valid addition to this code fixer.

Also, maybe one hardcoded option for this if this is a F# coding guideline / increase the "code I like" factor, when self reference is desired. VS code fixer is good place to suggest it.

I personally use x more than this, so I'd like an option to put my own name in the list as well.

[heronbpv]

Adding to @smoothdeveloper suggestion, is it possible to infer from context, as in, if other members in the type are using this/x/self/etc, suggest it, and "_" otherwise?

[cartermp]

That could be an interesting follow up, but it's not something I'm interested in taking on here.

[KevinRansom]

@cartermp : it's interesting that the error message uses the suggestion

• x.Member(args) =

and the codefixer adds: _.Member(args) =

I can see arguments either way, but without contextual analysis, the error message should probably match the fixer and propose _.Foo() in this case.

What do you think?

[cartermp]

I will just switch to x for now. It's also used quite a bit as examples online.