[Backport r51255 | neal.norwitz]

Really address the issue of where to place the assert for leftblock.
(Followup of Klocwork 274)

1 files changed, 1 insertions, 0 deletions

diff --git a/Modules/collectionsmodule.c b/Modules/collectionsmodule.c
index 1cceb4f587..4457551bb0 100644
--- a/Modules/collectionsmodule.c
+++ b/Modules/collectionsmodule.c
@@ -211,6 +211,7 @@ deque_popleft(dequeobject *deque, PyObject *unused)
 		PyErr_SetString(PyExc_IndexError, "pop from an empty deque");
 		return NULL;
 	}
+	assert(deque->leftblock != NULL);
 	item = deque->leftblock->data[deque->leftindex];
 	deque->leftindex++;
 	deque->len--;