1 files changed, 5 insertions, 0 deletions
diff --git a/Python/ceval.c b/Python/ceval.c
index 70748e8..3c52c58 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4212,6 +4212,11 @@ handle_eval_breaker:
             PREDICTED(FOR_ITER);
             /* before: [iter]; after: [iter, iter()] *or* [] */
             PyObject *iter = TOP();
+#ifdef Py_STATS
+            extern int _PySpecialization_ClassifyIterator(PyObject *);
+            _py_stats.opcode_stats[FOR_ITER].specialization.failure++;
+            _py_stats.opcode_stats[FOR_ITER].specialization.failure_kinds[_PySpecialization_ClassifyIterator(iter)]++;
+#endif
             PyObject *next = (*Py_TYPE(iter)->tp_iternext)(iter);
             if (next != NULL) {
                 PUSH(next);