commit 3ccc31386da5f35f83756a265429831d650db731
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Mon May 21 07:10:27 2018 -0700
committer GitHub <noreply@github.com> Mon May 21 07:10:27 2018 -0700
tree 77a7043a033346d11bd2290a23c97cace52b629a
parent ea9a0994cd0f4bd37799b045c34097eb21662b3d

bpo-33583: Add note in PyObject_GC_Resize() doc (GH-7021)

(cherry picked from commit 1179f4b40f375af5c59cd4b6be9cc313fa0e1a37)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

Modules/gcmodule.c

diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 916e481..19011c4 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -1539,6 +1539,7 @@
 {
     const size_t basicsize = _PyObject_VAR_SIZE(Py_TYPE(op), nitems);
     PyGC_Head *g = AS_GC(op);
+    assert(!IS_TRACKED(op));
     if (basicsize > PY_SSIZE_T_MAX - sizeof(PyGC_Head))
         return (PyVarObject *)PyErr_NoMemory();
     g = (PyGC_Head *)PyObject_REALLOC(g,  sizeof(PyGC_Head) + basicsize);