[Accepted] SE-0279: Multiple Trailing Closures

[clayellis]

For those who haven't already seen it, @xwu has started a thread with a draft proposal to add support for the use of an optional label for the first trailing closure.

Support use of an optional label for the first trailing closure

The core team has asked that discussion be spawned in a separate thread regarding support for use of an optional label for the first trailing closure. Therefore, later today, I'll be sharing a draft proposal here which addresses that topic. While it has been brought to mind by discussions on multiple trailing closures, the issue is entirely a separable one. Shortcomings related to our unlabeled trailing closure syntax have been known for years. Readers will note that the draft proposal is ampl…