Add ly:staff-symbol-line-thickness Scheme-callback, returning line thickness

[lilypond.git] / lily / spanner.cc

diff --git a/lily/spanner.cc b/lily/spanner.cc
index e73399dae07db19a06887cb09b25006be09b8716..0ae372ded3d4d485541efaeb14c4a351eaa25b1c 100644 (file)
--- a/lily/spanner.cc
+++ b/lily/spanner.cc
@@ -191,7 +191,7 @@ Spanner::set_bound (Direction d, Grob *s)
   Item *i = dynamic_cast<Item *> (s);
   if (!i)
     {
-      programming_error ("must have Item for spanner bound");
+      programming_error ("must have Item for spanner bound of " + name());
       return;
     }