> On May 20, 2016, at 10:43 AM, Brandon Knope via swift-evolution 
> <[email protected]> wrote:
> 
> From the compilers/runtimes perspective why couldn't the declaration 
> automatically be included in the main protocol definition as if it was 
> defined there?

Assuming you have protocol extenders and protocol implementors as different 
people, they are competing in the same problem space. The odds of an 
unintentional name collision is higher than normal, in which case the person 
implementing a protocol just unknowingly changed behavior for everyone relying 
on that extension.

The implementors can’t look at the protocol to find out the list of 
requirements on the protocol anymore - they have to also find every extension.

-DW

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