4.0.1: menucomplete quirk leaving extra characters behind

[Jos Backus <josb@xxxxxxxxxx>]

traitor:~% zsh -f
traitor% autoload -U compinit ; compinit
traitor% setopt menucomplete
traitor% _

Now when I hit <Tab>, I see:

traitor% \!
zsh: do you wish to see all 2188 possibilities (730 lines)? _

Answering ``n'' gives:

traitor% \!_

with the cursor sitting behind the !.

(Btw, on Solaris the characters are ``!='' instead.)

Any idea what causes this?

Thanks,
-- 
Jos Backus                 _/  _/_/_/        "Modularity is not a hack."
                          _/  _/   _/                -- D. J. Bernstein
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