From 8f49e12a0e0805ec61690263ef1ef15340293980 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Mon, 6 Jan 1997 22:55:54 +0000
Subject: Make builtin_module_names a tuple instead of a list.

---
 Python/sysmodule.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index d32562e..568f45a 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -232,6 +232,11 @@ list_builtin_module_names()
 		DECREF(list);
 		list = NULL;
 	}
+	if (list) {
+		object *v = listtuple(list);
+		DECREF(list);
+		list = v;
+	}
 	return list;
 }
 
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