[swift-evolution] extending typealiases

[Douglas Gregor]

> On Feb 6, 2017, at 10:06 AM, Anton Zhilin via swift-evolution <swift-evolution at swift.org> wrote:
> 
> If I understand correctly, extension of a typealias should be strictly equivalent to extension of type on the right:
> 
> extension Any<class> {
>     func foo()
> }
> And Any<...> are not nominal types, so until we additionally allow extensions for non-nominal types, this will not compile.
> 
	
Right.

Note that we capriciously banned extending AnyObject so y’all couldn’t sneak in code that would prevent AnyObject from turning into “an existential describing values of class type” :)

	- Doug
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