> On Jan 1, 2017, at 7:13 PM, John Schmidt <john.schmid...@gmail.com> wrote:
> 
> Steve: both ::game3 and ::game4 from your suggestions result in the same 
> error.
> 

Sorry for my mistaken conjecture.  My issue with the macroexpansion looks like 
a red herring.  I guess I confused myself with quick tests in the REPL. 

The problem seems to be sensitive to the order of the declaration of the 
predicates versus the protocol extension.  That is, it seems to work for me if 
I do the extend-type Foo before defining the predicates that refer to the 
protocol.  I probably did this accidentally while playing in the REPL. 

So now I think the issue is that one version of the protocol was captured by 
the “early" predicates, and then the protocol itself was changed so references 
to the “old” protocol (with the same name) no longer worked.

The #(…) closure seems to do the right thing as the protocol symbol doesn’t get 
evaluated at definition time.

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