visit_decref(): Added another assert.

diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index a623e8b0c34bd3d71e680e4aeb9ca9d5c64df5ac..6df2485bd66eeca003785d90b44c921e681f49d0 100644 (file)
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -224,6 +224,7 @@ visit_decref(PyObject *op, void *data)
                 * generation being collected, which can be recognized
                 * because only they have positive gc_refs.
                 */
+               assert(gc->gc.gc_refs != 0); /* else refcount was too small */
                if (gc->gc.gc_refs > 0)
                        gc->gc.gc_refs--;
        }