Ah the old nil values boxed into non-nil interfaces. Even after 8 years writing go code almost every day this still bites me occasionally. I've never seen code that actually uses this. I understand why it is the way it is but I hate it.
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Then again that would mean that the nil identifier would be coerced into a typed nil and we would check for the nilness of what is inside an interface in any(somepointer) == nil.
wrt the current behavior, it also makes sense to have a nil value that remains untyped. But in many other cases we do have that automatic inference/coercion, for instance when we set a pointer to nil.(p = nil)
That's quite subtle and that ship has sailed though.
It's not straightforward but probably something that will be considered at some point I reckon when thinking about making union interfaces first class. That will require to track a not nil typestate/predicate in the backend, something like that I guess.
basically `if v.(nil){...}
creates two branches. In one we know v is not nil (outside the if block) and it can therefore be assigned to non nillable variables so to speak...