Index: ext/fiddle/conversions.c
===================================================================
--- ext/fiddle/conversions.c	(revision 34755)
+++ ext/fiddle/conversions.c	(working copy)
@@ -134,6 +134,8 @@ generic_to_value(VALUE rettype, fiddle_g
       default:
 	rb_raise(rb_eRuntimeError, "unknown type %d", type);
     }
+
+    return Qnil; /* not reached */
 }
 
 /* vim: set noet sw=4 sts=4 */