Re: kill-emacs-query-functions problem with y-or-n-p

[Richard M. Stallman]

    I did run through the debugger (debug-on-entry foo), checking
    last-nonmenu-event at each step. The value remained `(menu-bar)' throughout,
    right up through debugger-reenable in run-hooks(post-command-hook). 

Why was post-command-hook being run?  We're talking about code in the middle
of kill-emacs; it does not read commands, and Emacs should never read
another command once you start killing it.  Perhaps the Lisp debugger
interfered.

The way to handle this best is by debugging at the C level,
with breakpoints and stepping in Fkill_emacs and Fy_or_n_p
and their subroutines.