> On Nov 30, 2017, at 10:31 PM, Chris Lattner <clatt...@nondot.org> wrote:
> The Objective-C runtime does not track the type of members or methods.

Ok, this statement isn’t factually true: I’ll admit that there are two related 
things to this: the GNU ObjC runtime does track some method types, and ObjC 
does have @encode strings, which encode a subset of the ObjC type system.  

While both are true, neither are used by Swift AnyObject lookup, so the rest of 
the points still hold.


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