X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fsemi-tie.cc;h=0d31a2e07388b82e1ad0627b57f10d124e8bd5d9;hb=d6bb35d94789444016eac15987b877fc59b526cf;hp=049cd029d6c40d56eb9348e81b0639bf9f70cf12;hpb=0a34e892b31530e87380bffaac0bb9cf9a1c8a91;p=lilypond.git

diff --git a/lily/semi-tie.cc b/lily/semi-tie.cc
index 049cd029d6..0d31a2e073 100644
--- a/lily/semi-tie.cc
+++ b/lily/semi-tie.cc
@@ -60,7 +60,7 @@ Semi_tie::calc_control_points (SCM smob)
   (void) me->get_property ("direction");
 
   Grob *yparent = me->get_parent (Y_AXIS);
-  if (Semi_tie_column::has_interface (yparent))
+  if (has_interface<Semi_tie_column> (yparent))
     {
       /* trigger positioning. */
       yparent->get_property ("positioning-done");
@@ -89,13 +89,20 @@ bool
 Semi_tie::less (Grob *g1, Grob *g2)
 {
   Item *i1 = dynamic_cast<Item *> (g1);
+  if (!i1)
+    {
+      g1->programming_error ("grob is not a semi-tie");
+      return false;
+    }
+
   Item *i2 = dynamic_cast<Item *> (g2);
-  if (i1 && i2) {
-    return get_position (i1) < get_position (i2);
-  }
+  if (!i2)
+    {
+      g2->programming_error ("grob is not a semi-tie");
+      return true;
+    }
 
-  programming_error ("grob is not a semi-tie");
-  return false;
+  return get_position (i1) < get_position (i2);
 }
 
 Item *