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kotlinlang

It's not for testing, I'm an android developer and it happens fairly often that we have to implement interfaces only to override one method which brings lots of boilerplate code

bmo: in some scenarios, such as the `AnimationListener` you have the `AnimationListenerHandler` which provides the behavior you're expecting

Yes, it does but not always :slightly_smiling_face:

true, but does it make sense to add something to the stdlib something like that?

I don't know, I'm wondering that's why it's a proposal :slightly_smiling_face:

Isnt this only useful because you are implementing java interfaces ? I mean most ideomatic kotlin would not have nullable return types on methods

May be, indeed. But it's also fairly common to have interfaces which don't expect any return (`void` or `Unit` depending on the language) for their methods or just booleans