> On Oct 14, 2016, at 12:59 PM, Chris Lattner via swift-evolution 
> <swift-evolution@swift.org> wrote:
> Hello Swift community,
> The review of "SE-0144: Allow Single Dollar Sign as a Valid Identifier" 
> begins now and runs through October 18. The proposal is available here:
> https://github.com/apple/swift-evolution/blob/master/proposals/0144-allow-single-dollar-sign-as-valid-identifier.md
> Reviews are an important part of the Swift evolution process. All reviews 
> should be sent to the swift-evolution mailing list at
>       https://lists.swift.org/mailman/listinfo/swift-evolution
> or, if you would like to keep your feedback private, directly to the review 
> manager.
> What goes into a review?
> The goal of the review process is to improve the proposal under review 
> through constructive criticism and contribute to the direction of Swift. When 
> writing your review, here are some questions you might want to answer in your 
> review:
>       * What is your evaluation of the proposal?
>       * Is the problem being addressed significant enough to warrant a change 
> to Swift?
>       * Does this proposal fit well with the feel and direction of Swift?
>       * If you have used other languages or libraries with a similar feature, 
> how do you feel that this proposal compares to those?
>       * How much effort did you put into your review? A glance, a quick 
> reading, or an in-depth study?

-1 from me.

The library in question was exploiting a bug in the compiler. I went and 
checked the officially published Swift 1.0 grammar and “$” is not a valid 

I’m sympathetic to the argument that the behavior shipped in three major 
versions but ultimately all this does is create an opportunity for cute tricks.


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