diff options
| -rw-r--r-- | Modules/_collectionsmodule.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c index b2783d2739..69d93ae6a6 100644 --- a/Modules/_collectionsmodule.c +++ b/Modules/_collectionsmodule.c @@ -534,13 +534,13 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n) if (m > leftindex) m = leftindex; assert (m > 0 && m <= len); - src = &rightblock->data[rightindex]; - dest = &leftblock->data[leftindex - 1]; rightindex -= m; leftindex -= m; + src = &rightblock->data[rightindex + 1]; + dest = &leftblock->data[leftindex]; n -= m; do { - *(dest--) = *(src--); + *(dest++) = *(src++); } while (--m); } if (rightindex == -1) { |