Agree with Robert here. I'd rather be able to use it as part of operators. 
Currently the character set for operators and identifier head are mutually 
exclusive. So this proposal will remove that possibility. This deserves some 
discussion.

Daniel Duan
Sent from my iPhone

> On Oct 14, 2016, at 1:33 PM, Robert Widmann via swift-evolution 
> <swift-evolution@swift.org> wrote:
> 
> As the author of the patch that introduced this and the patch that will come 
> out of this discussion, I have no problems one way or the other.  Just bear 
> in mind that if $ is an identifier head character then it cannot be used in 
> operators - something I have a library with a vested interest in.
> 
> ~Robert Widmann
> 
>> On Oct 14, 2016, at 3:59 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?
>> 
>> More information about the Swift evolution process is available at
>> 
>>      https://github.com/apple/swift-evolution/blob/master/process.md
>> 
>> Thank you,
>> 
>> -Chris Lattner
>> Review Manager
>> 
>> 
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