> On Oct 5, 2015, at 8:19 PM, Rick Mann <rm...@latencyzero.com> wrote:
> 
>> On Oct 5, 2015, at 18:12 , Jens Alfke <j...@mooseyard.com 
>> <mailto:j...@mooseyard.com>> wrote:
>> 
>> NSURLComponents is a class, not a struct, so ‘url3’ is a reference, not a 
>> value, and ‘let’ just means you can’t reassign ‘url3’ to point to another 
>> object.
> 
> But it wasn't allowed in the copy() case.

That’s because it doesn’t *know* it’s a class in the copy() case. An AnyObject 
could be a class *or* a struct. The compiler errs on the side of caution.

Charles

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