A modern programming language that makes developers happier.

kotlinlang

yes. only 2xx responses contain bodies of that type

is there any way to do smart casting? eg ```if (response.isSuccessful)```?

isn't it possible with kotlin's contracts? (sorry for the necroposting :S)

I was actually just about to post this. Contracts are still experimental. Maybe it will be implemented once they're considered stable?

Reading about them now, it seems it would be impossible
&gt; We can only apply contracts on top-level functions with a body, i.e. we can't use them on fields and class functions.

unless `Response.body` were implemented as as an inlined extension function