[swift-evolution] [Core team] Addressing the SE-0110 usability regression in Swift 4


The Swift core team feels that these usability regressions are unacceptable for Swift 4. There are a number of promising solutions that would provide a better model for closures and address the usability regression, but fully designing and implementing those are out of scope for Swift 4. Therefore, we will “back out” the SE-0110 change regarding function arguments from Swift 4.


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