Issue #20625: Fix compilation issue
diff --git a/Python/compile.c b/Python/compile.c
index 57a2329..9978eb3 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1532,8 +1532,9 @@
     expr_ty annotation, PyObject *names)
 {
     if (annotation) {
+        PyObject *mangled;
         VISIT(c, expr, annotation);
-        PyObject *mangled = _Py_Mangle(c->u->u_private, id);
+        mangled = _Py_Mangle(c->u->u_private, id);
         if (!mangled)
             return -1;
         if (PyList_Append(names, mangled) < 0) {