Anthony Trollope used em dashes with a colon, I believe.
On Tue, 7 Dec 1999 09:59:11 Axel Reichert wrote:
>andy crewdson <[log in to unmask]> writes:
>> Still, to me an em dash without spaces looks tighter and
>> more pleasing.
>But causes lots of hyphenation woes (at least if you do not care about
>dashes at the beginning or end of lines).
>Axel Reichert -- http://www.axel-reichert.de
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