From b33c7d1a84bc3f460019c0923d5f6650607fe5f6 Mon Sep 17 00:00:00 2001
From: Salvo 'LtWorf' Tomaselli <ltworf@users.noreply.github.com>
Date: Wed, 14 Feb 2018 17:11:19 +0100
Subject: [PATCH] Add missing private field to NamedTuple (#1866)

It is very useful for doing introspection.
---
 stdlib/3/typing.pyi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/stdlib/3/typing.pyi b/stdlib/3/typing.pyi
index bea2450bf..e21528f41 100644
--- a/stdlib/3/typing.pyi
+++ b/stdlib/3/typing.pyi
@@ -535,6 +535,7 @@ def cast(tp: Type[_T], obj: Any) -> _T: ...
 
 # NamedTuple is special-cased in the type checker
 class NamedTuple(tuple):
+    _field_types = ...  # type: collections.OrderedDict[str, Type[Any]]
     _fields = ...  # type: Tuple[str, ...]
     _source = ...  # type: str