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diff --git a/tmac/tests/an_LL-init-sanely.sh b/tmac/tests/an_LL-init-sanely.sh
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+++ b/tmac/tests/an_LL-init-sanely.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+#
+# Copyright (C) 2020 Free Software Foundation, Inc.
+#
+# This file is part of groff.
+#
+# groff is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# groff is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+groff="${abs_top_builddir:-.}/test-groff"
+
+# Regression-test Savannah #58992.
+#
+# Our man macros should no longer attempt to read the .l register on
+# nroff devices to set the line length.  That register may or may not
+# have been set by a user .ll request; we can't tell whether a value of
+# 65n came from nroff or the user.
+#
+# Instead, the LL register must be used to set the line length.
+#
+# In this test we _expect_ the .ll request to be ignored and overridden.
+# We choose a value that is not nroff's default nor man's default.
+
+EXAMPLE='
+.ll 70n
+.TH ll\-hell 1 2020-08-22 "groff test suite"
+.SH Name
+ll\-hell \- see how long the lines are
+.SH Description
+LL=\n[LL]u
+.PP
+\&.l=\n[.l]u'
+
+printf "%s\n" "$EXAMPLE" | "$groff" -Tascii -P-cbou -man \
+    | grep -q 'LL=1872u'
+
+# vim:set ai et sw=4 ts=4 tw=72: