For Swift 3, we're planning to phase out 'var' parameters in functions, and
we're also making it so that language keywords are valid argument labels. With
both of these changes pending, I have a hard time not reading:
func foo(inout x: Int)
as an argument labeled `inout` instead of an unlabeled argument bound to `x`.
Once `var` is phased out, `inout` would also be the only remaining case where
quoting is necessary to use a name as an argument label. The `inout` keyword
has always struck me as weird, since it violates definition-follows-use—maybe
we should replace it with the `&` sigil, mirroring its usage in call sites.
-Joe
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