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-rw-r--r--Modules/_abc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/Modules/_abc.c b/Modules/_abc.c
index 434bc45..709b52f 100644
--- a/Modules/_abc.c
+++ b/Modules/_abc.c
@@ -46,6 +46,7 @@ typedef struct {
static int
abc_data_traverse(_abc_data *self, visitproc visit, void *arg)
{
+ Py_VISIT(Py_TYPE(self));
Py_VISIT(self->_abc_registry);
Py_VISIT(self->_abc_cache);
Py_VISIT(self->_abc_negative_cache);