=== modified file 'src/alloc.c'
--- src/alloc.c	2014-04-03 00:37:51 +0000
+++ src/alloc.c	2014-04-03 06:42:53 +0000
@@ -6174,6 +6174,11 @@
 	  break;
 	CHECK_ALLOCATED_AND_LIVE (live_symbol_p);
 	ptr->gcmarkbit = 1;
+	/* Attempt to catch bogus objects.  */
+	eassert (SYMBOLP (ptr->function)
+		 || CONSP (ptr->function)
+		 || COMPILEDP (ptr->function)
+		 || SUBRP (ptr->function));
 	mark_object (ptr->function);
 	mark_object (ptr->plist);
 	switch (ptr->redirect)
@@ -6601,6 +6606,11 @@
               if (!pure_p)
                 eassert (!STRING_MARKED_P (XSTRING (sym->s.name)));
               sym->s.gcmarkbit = 0;
+              /* Attempt to catch bogus objects.  */
+              eassert (SYMBOLP (sym->s.function)
+                       || CONSP (sym->s.function)
+                       || COMPILEDP (sym->s.function)
+                       || SUBRP (sym->s.function));
             }
         }