Parser: recover on unfinished type declarations

[auduchinok]

Various unfinished type cases:

typeTwith()

type

typeT=

typeT1= int
and

typeT1= int
andT2=

typeT1= int
andandT3= int

Unfinished types ending with with and = are recovered due to the new indentation rules.

[auduchinok]

Phew, this one is ready too! 🎉

It was the most difficult to go through the CI so far due to disallowing this:

typeTwithmemberthis.NoIndentation=1// breaks parsing of things below

Like in #15392, it now produces a new indentation warning with the old rules, and an error with the new ones.

Deindenting union cases is still allowed as it allows subsequent things to be parsed correctly:

typeU=| A // there's an existing special case allowing this for union cases()

[edgarfgp]

Will this cover the cases unfinished code with types using the using verbose syntax ?.

[auduchinok]

@edgarfgp Could you elaborate, please?

[edgarfgp]

Sure. I was referring to the cases with

typeA=class//end --missing endtypeI=interface// --missing end

[auduchinok]

I see, thanks.
No, I haven't touched those parts of the grammar yet.