From 530cac53c586ef201eb5c252d6b6333f03d27ea3 Mon Sep 17 00:00:00 2001
From: Holger Vogt <holger.vogt@uni-due.de>
Date: Fri, 2 Nov 2018 23:49:07 +0100
Subject: [PATCH] bug 337: keep '-' as sign of number following tc1, tc2

---
 src/frontend/inpcom.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/frontend/inpcom.c b/src/frontend/inpcom.c
index c3e252826..325345b28 100644
--- a/src/frontend/inpcom.c
+++ b/src/frontend/inpcom.c
@@ -5728,7 +5728,8 @@ inp_modify_exp(char* expr)
                     } else {
                         wl->wl_word = tprintf("({%s})", buf);
                     }
-
+                    /* '-' following the '=' is attached to number as its sign */
+                    c_arith = TRUE;
                 } else {
                     /* {} around all other tokens */
                     wl->wl_word = tprintf("({%s})", buf);