* input/test/time-signature-double.ly: new file

[lilypond.git] / lily / grob-property.cc

diff --git a/lily/grob-property.cc b/lily/grob-property.cc
index 768f0d0724821163086fee9ea390c878eca62e06..a24ee01cd95bfc9c8b91bbcf819d1e2c6da91062 100644 (file)
--- a/lily/grob-property.cc
+++ b/lily/grob-property.cc
@@ -74,7 +74,7 @@ Grob::internal_set_grob_property (SCM s, SCM v)
 
   if (internal_type_checking_global_b)
     {
-      if (type_check_assignment (s, v, ly_symbol2scm ("backend-type?")))
+      if (!type_check_assignment (s, v, ly_symbol2scm ("backend-type?")))
        abort ();
       check_interfaces_for_property (this, s);
     }