patch 9.0.1179: not all errors around inheritance are tested

Problem:    Not all errors around inheritance are tested.
Solution:   Add more tests.  Fix uncovered problems.
diff --git a/src/version.c b/src/version.c
index 1c8bf60..b16a3f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1179,
+/**/
     1178,
 /**/
     1177,