Empty VS null array?

[Max Samukha]

On Friday, 18 October 2013 at 16:55:19 UTC, Andrei Alexandrescu 
wrote:
>
> Fair point. I just gave one possible alternative out of many. 
> Thing is, relying on client code to distinguish subtleties 
> between empty and null strings is fraught with dangers.
>
> Andrei

I agree. Thinking about your variant of readln - it's ok to use 
[] as the value indicating EOF, since it is not included in the 
value set of type "line" as you define it. But generally, neither 
cast(T[])[] nor cast(T[])null should be used like that, because 
both of them are in the set of T[]'s values, i.e. a generic 
stream returning [] to signify its end would be a bad idea - that 
should be either a side effect or a value outside T[]'s set.

Hm, I've just said nothing with many words. Never mind.