From f7a7e0ea4da7dbbe0e9c916ff153f7efbc95bc3e Mon Sep 17 00:00:00 2001
From: Zac-HD <zac.hatfield.dodds@gmail.com>
Date: Sat, 11 Jan 2020 11:27:40 +1100
Subject: [PATCH] Note size limit for len()

---
 Doc/library/functions.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index dc3391ffe882de..cc48597ef91d50 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -892,6 +892,11 @@ are always available.  They are listed here in alphabetical order.
    sequence (such as a string, bytes, tuple, list, or range) or a collection
    (such as a dictionary, set, or frozen set).
 
+   .. impl-detail::
+
+      ``len`` raises :exc:`OverflowError` on lengths larger than
+      :data:`sys.maxsize`, such as :class:`range(2 ** 100) <range>`.
+
 
 .. _func-list:
 .. class:: list([iterable])