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I wrote:

>Neither the function documentation strings (in Emacs version 18.58) nor
>the Emacs Lisp manual entries (version 1.03) document the fact that as
>implemented in minibuf.c, the second argument to try-completion and
>all-completions may be a non-list function object (e.g. a symbol). In
>that case, the result of try-completion or all-completions is obtained
>by calling that functional argument (ALIST) with 3 arguments: the
>completion function's first argument STRING, its third argument PRED,
>and nil.

Sorry, this is not true.  The lisp manual does mention that the second
argument may be a function; in try-completion's entry, the description
of that case follows -- for whatever reason -- the description of the
third argument.  There is also a reference to the following node, which
describes 'Programmed Completion' in detail.  Also, the third argument
passed to the function arg is nil only in the case of try-completion;
all-completions passes t instead.

Mea culpa,

Kevin Rodgers				kevin@traffic.den.mmc.com
Martin Marietta MS A16401		(303) 790-3971
116 Inverness Dr. East
Englewood CO 80112 USA			GO BUFFS!