(defun foo () (y-or-n-p "foo? "))
        (defun bar () (y-or-n-p "bar? "))
        (setq kill-emacs-query-functions '(foo bar))

        2. Use the menu-bar File > Exit Emacs.

        The question "foo? " correctly appears in a popup menu y/n.

        3. Respond `n'  to "foo? ".

        4. The question "bar? " should be asked via a popup menu
           also, but it
           appears instead in the minibuffer.

    This is controlled by last-nonmenu-event.  At C level, it is
    last_nonmenu_event.  Can you determine where and how it gets altered
    when foo asks its question?

Sorry, I don't have much time to debug this.

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). However,
after run-hooks(post-command-hook), the value was nil, so it was nil when
run-hooks(activate-menubar-hook) was run.




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