Update of bug #64013 (project groff):
Status: Postponed => In Progress
Planned Release: 1.24.0 => None
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Follow-up Comment #2:
In my branch for pushing next week.
diff --git a/tmac/s.tmac b/tmac/s.tmac
index 6870656b1..7a6ec8283 100644
--- a/tmac/s.tmac
+++ b/tmac/s.tmac
@@ -1885,15 +1885,20 @@ along with this program. If not, see
<http://www.gnu.org/licenses/>.
.if \\n[tbl@within-table] \
. @error .EQ is not allowed within a .TS/.TE table
.br
+.nr eqn*type -1
.ds eqn*num "\\$2
-.ie '\\$1'L' .nr eqn*type 0
-.el \{\
-. ie '\\$1'I' .nr eqn*type 1
-. el \{\
-. nr eqn*type 2
-. if !'\\$1'C' .ds eqn*num "\\$1
+.if '\\$1'L' .nr eqn*type 0
+.if '\\$1'I' .nr eqn*type 1
+.if '\\$1'C' .nr eqn*type 2
+.ie (\\n[eqn*type] < 0) \{\
+. ie (\\n[.$] = 1) .if !'\\$1'' \{\
+. ds eqn*msg .EQ: unrecognized alignment '\\$1';
+. as eqn*msg " assuming it is an equation label
+. @warning \\*[eqn*msg]
+. ds eqn*num "\\$1
+. rm eqn*msg
. \}
-.\}
+.el .if !'\\$1'' .@error .EQ: unrecognized alignment '\\$1'
.di eqn*div
.in 0
.if '\*(.T'html' \{\
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