From 018e6b9f696311a65f47f33ea04b7baef3f3664f Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 23 Sep 2017 19:46:24 -0700
Subject: [PATCH] bpo-31564: Update typing documentation (GH-3696) (GH-3715)

Mention that ``NewType`` can derive from another ``NewType``.
(cherry picked from commit 039b25d8fd21f8d5d9e3cb536402d952cf068dc1)
---
 Doc/library/typing.rst | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index 1e48fecdbf7..bd04f731a12 100644
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -111,8 +111,7 @@ More precisely, the expression ``some_value is Derived(some_value)`` is always
 true at runtime.
 
 This also means that it is not possible to create a subtype of ``Derived``
-since it is an identity function at runtime, not an actual type. Similarly, it
-is not possible to create another :func:`NewType` based on a ``Derived`` type::
+since it is an identity function at runtime, not an actual type::
 
    from typing import NewType
 
@@ -121,9 +120,16 @@ is not possible to create another :func:`NewType` based on a ``Derived`` type::
    # Fails at runtime and does not typecheck
    class AdminUserId(UserId): pass
 
-   # Also does not typecheck
+However, it is possible to create a :func:`NewType` based on a 'derived' ``NewType``::
+
+   from typing import NewType
+
+   UserId = NewType('UserId', int)
+
    ProUserId = NewType('ProUserId', UserId)
 
+and typechecking for ``ProUserId`` will work as expected.
+
 See :pep:`484` for more details.
 
 .. note::