[swift-evolution] [Proposal]: Free the '$' Symbol!

[Jacob Bandes-Storch]

Is it considered infeasible for any characters to be allowed in both
identifiers and operators?

On Sun, Jan 3, 2016 at 1:23 PM, Chris Lattner via swift-evolution <
swift-evolution at swift.org> wrote:

>
> > On Jan 2, 2016, at 11:53 PM, Brent Royal-Gordon via swift-evolution <
> swift-evolution at swift.org> wrote:
> >
> >> Swift currently does not allow operators to use $ - I assume because
> the grammar reserves it in one place: `implicit-parameter-name`.  I don't
> see why an entire class of identifiers has been eliminated, so I propose $
> instead be reclassified as an `operator-character` so it can be used mixed
> in with other such characters, but prevents the introduction of
> `$Identifier`-style declarations that might conflict with implicit
> parameters.
> >
> > I believe the reason you don't see any other $ variables is that they're
> reserved for the debugger and REPL.
> >
> >       brent at Brents-MacBook-Pro ~/D/Code> swift
> >       Welcome to Apple Swift version 2.1.1 (swiftlang-700.1.101.15
> clang-700.1.81). Type :help for assistance.
> >         1> "foo"
> >       $R0: String = "foo"
> >         2> print($R0)
> >       foo
>
> Right.  That said, our current operator space (particularly the unicode
> segments covered) is not super well considered.  It would be great for
> someone to take a more systematic pass over them to rationalize things.
>
> -Chris
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