Re: edebug: Symbol's function definition is void: nil

[Richard M. Stallman]

    I can't reproduce it now.  It think it occurred when I was stepping through 
a
    function past a symbol that evaluated to the empty string.  I enabled
    debug-on-error and seemed to get a backtrace at one point with just an entry
    for nil (but I didn't find it till later because it didn't pop up).
'

It sure sounds like a bug, but it is hard to guess the cause from this
info.