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Subject: Re: \leavevmode?
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2011/12/30 Joseph Wright <joseph.wright@morningstar2.co.uk>:
> In some parts of the coffin code, we do this 'directly' using
>
>  \hbox_unpack:N \c_empty_box

What about \quitvmode (available in pdfTeX and LuaTeX, but not XeTeX)?