All was fine in p0.76, but I'm getting the following bug out with p0.77.
Here is the value of my nnmail-spool-file; I've tried all three of the
below values for :port in an effort to get things working again, but no
luck with any of them.  I've tried to poke through the code and understand
which of the changes caused this, but I'm not sure if it's pilot error on
my end with the nnmail-spool-file variable or if something broke and my
elisp skills are a little sketchy anyway.

(setq nnmail-spool-file
      '((file :path "/var/mail/mmp")
        (pop :server "mail.slip.net"
;;	     :port "pop"
;;	     :port 110
;;           :port "110"
             :user "foo")))