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[bug #60954] [troff] implement environment removal


From: T. Kurt Bond
Subject: [bug #60954] [troff] implement environment removal
Date: Wed, 21 Jul 2021 15:46:48 -0400 (EDT)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Follow-up Comment #2, bug #60954 (project groff):

Tadziu Hoffmann's version is

.de CI
.ds xx \\n[.fam]
.fam C
.I \\$@\F[]\F[\\*[xx]]
.fam
..


Werner then says:
> Excellent!  This is *very* nice.  BTW, attaching something directly to
> \$@ doesn't work: Saying `\$@foo' as a macro argument is equivalent to
> `\$@ foo'.  So this is probably the final version:


.de CI
.  ds xx \\n[.fam]
.  fam C
.  I \\$@ \F[]\F[\\*[xx]]
.  fam
..


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