What is your evaluation of the proposal?
Huge +1. I will also start (ab)using this feature for some DSL stuff.
Is the problem being addressed significant enough to warrant a change to Swift?
Yes.
How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
Rather in-depth study and was following the discussions since the beginning.
Thanks @Chris_Lattner3 for pushing this forward. By the way, Is callable type proposal also coming up after this?