While upgrading to Swift 3, I noticed that I had a few enums with cases named 
.Default that, after being converted to lowercase, now need to be rendered 
using the ugly .`default` notation.

I also noticed something similar while reading the docs for NotificationCenter 
(the NSNotificationCenter replacement, that is, not the NotificationCenter that 
governs the notification center UI); “default” can’t be used as a function name 
without escaping, so the declaration is:

class func `default`()

It seems to me that in the case of function names and enum cases, the parser 
should be able to unambiguously distinguish between the Swift keyword “default” 
and a user-defined name “default”, since IIRC the keyword “default” can only be 
used in parameter lists for generated headers and as the last item in a switch 
statement.

(Perhaps this is also another argument in favor of using “case _:” in place of 
“default:” in a switch statement.)

What do you think? Is there any reason this *wouldn’t* be feasible?
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