[swift-evolution] [Review] SE-0144: Allow Single Dollar Sign as a Valid Identifier

[Jonathan S. Shapiro]

Several people here have called out implicit closure parameters as a
concern, which is actually irrelevant to adopting '$' in parameters.

It is perfectly feasible to accept '$' in parameters *generally*, and
reject identifiers of the form

$ followed by one or more decimal digits


in defining occurrences. This is completely compatible with current Swift
practice, and logically consistent with other kinds of reserved words.

I'm not taking a position pro or con here. I'm saying that we should reject
non-impacting arguments as a basis for deciding one way or the other.


Jonathan
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