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-rw-r--r--Python/bltinmodule.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 29e33939b3..3d977f484a 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1682,6 +1682,10 @@ initbuiltin()
initerrors();
(void) dictinsert(builtin_dict, "None", None);
(void) dictinsert(builtin_dict, "Ellipsis", Py_Ellipsis);
+ (void) dictinsert(builtin_dict, "__debug__",
+ newintobject(Py_OptimizeFlag == 0));
+ if (err_occurred())
+ fatal("error creating None/Ellipsis/__debug__ in __builtin__");
}