Follow-up Comment #7, bug #64597 (project groff):
Hi Sven,
The difference here, perhaps a subtle one, is that the 'r' conditional
operator doesn't *interpolate* a register.
I have the following change pending in my Git working copy.
commit b99fa24b508c8ca20356bde37de686986965177f
Author: G. Branden Robinson <g.branden.robin...@gmail.com>
Date: Sun Aug 27 04:05:31 2023 -0500
[docs]: Conditional operators don't create things.
...not registers or strings/macros/diversions, at any rate.
Prompted by discussion with Peter Schaffter in
<https://lists.gnu.org/archive/html/groff/2023-08/msg00142.html>.
diff --git a/doc/groff.texi b/doc/groff.texi
index 73c79c6f4..9fa6bd913 100644
--- a/doc/groff.texi
+++ b/doc/groff.texi
@@ -12853,6 +12853,9 @@ @node Operators in Conditionals
The unexpected @samp{r x} in the output is a clue that our conditional
was not interpreted as we planned, but matters may not always be so
obvious.
+
+Conditional operators do not create @code{roff} language objects as
+interpolations with @code{\n} and @code{\*} escape sequences do.
@c END Keep (roughly) parallel with subsection "Conditional expressions"
@c of groff(7).
diff --git a/man/groff.7.man b/man/groff.7.man
index 2fdb5e98b..a6cb0ed1a 100644
--- a/man/groff.7.man
+++ b/man/groff.7.man
@@ -2210,6 +2210,16 @@ .SS "Conditional expressions"
.
(This bizarre behavior maintains compatibility with AT&T
.IR troff .)
+.
+.
+.P
+Conditional operators do not create
+.I roff
+language objects as interpolations with
+.B \[rs]n
+and
+.B \[rs]*
+escape sequences do.
.\" END Keep (roughly) parallel with groff.texi node "Operators in
.\" Conditionals".
.
[snip]
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