Index: struct.c
===================================================================
--- struct.c	(Revision 45452)
+++ struct.c	(Arbeitskopie)
@@ -94,7 +94,7 @@
 	    return RSTRUCT_GET(obj, i);
 	}
     }
-    rb_name_error(id, "%s is not struct member", rb_id2name(id));
+    rb_name_error(id, "`%s' is not a struct member", rb_id2name(id));
 
     UNREACHABLE;
 }