Whenever I use a closure and press enter for the suggestion my Xcode gets crashed. I am using Macbook Pro 15 Retina with graphics card 2015 Model. I am using latest OS Sierra 10.12.1. Never faced this kind of issue in Xcode 8. Any One having similar issue like me?
it seems to be fixed in Xcode 8.2.
try upgrading your Xcode, it totally works fine for me in Xcode 8.2