Re: Add support for a compare-fn in add-to-list

Tuesday, 26 February 2008

        Brian Palmer writes:

...
    (if (member* element (symbol-value list-var)

 >                 :test (or compare-fn #'equal))

 Since subr.el is dumped before cl.el, I wanted to make sure that if anything
 pre-CL did call add-to-list, it'd at least work if they avoided the :test
 case. But nothing seems to, so I suppose this would be safe? 
Hm, that's a good point.  On the other hand, add-to-list is a pretty
userland kind of function.  Maybe it should be moved later.  Also,
member* is defined as a compiler macro; it would be nice if that could
be used.

...
 > Do we have any use cases for :test functions other than member?

 Emacs also seems to offer a memql, but I'm not sure how much use it is other
 than completism. 
A "use case" is real code, not an accident of API.  I'll take that as
a "no". ;-)

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