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can't overstrike \0

From: Doug McIlroy
Subject: can't overstrike \0
Date: Wed, 6 May 2009 22:40:15 -0400

The construct
draws the diagnostic
<standard input>:1: normal or special character expected (got a node)
in groff 1.20.1.  Apparently \0 is not treated as a special character,
as it was in original troff.

Experiment shows that \o' .' fails the same way, which is defensible
because space doesn't have a definite width in all contexts.  Not so
for \0, which has the width of a digit.

(I encountered this in resurrecting a document from 1986; everything
else worked.)

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