Have set conversion replace existing constant if not used elsewhere.
diff --git a/Python/compile.c b/Python/compile.c
index dd58aa6..f90f82c 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -570,7 +570,13 @@
return 0;
}
- /* Append new constant onto consts list.*/
+ /* Append new constant onto consts list or replace existing constant
+ if there are no other references to it.*/
+ if (constant->ob_refcnt == 1) {
+ PyList_SET_ITEM(consts, arg, newconst);
+ Py_DECREF(constant);
+ return 1;
+ }
len_consts = PyList_GET_SIZE(consts);
if (PyList_Append(consts, newconst)) {
Py_DECREF(newconst);