Issue #10833: Use PyUnicode_FromFormat() and PyErr_Format() instead of
PyOS_snprintf().
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index 10a4ed7..b05675c 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -680,8 +680,8 @@
 static void
 debug_cycle(char *msg, PyObject *op)
 {
-    PySys_WriteStderr("gc: %.100s <%.100s %p>\n",
-                      msg, Py_TYPE(op)->tp_name, op);
+    PySys_FormatStderr("gc: %s <%s %p>\n",
+                       msg, Py_TYPE(op)->tp_name, op);
 }
 
 /* Handle uncollectable garbage (cycles with finalizers, and stuff reachable