From 7409af9f79937e8afa8b905672670f0233de3865 Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@osandov.com>
Date: Tue, 15 Sep 2020 12:14:00 -0700
Subject: [PATCH] Add SupportsIndex stub to typing_extensions (#4442)

This was added to typing_extensions in python/typing#724.
---
 third_party/2and3/typing_extensions.pyi | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/third_party/2and3/typing_extensions.pyi b/third_party/2and3/typing_extensions.pyi
index 9ccb38c3c..3566669eb 100644
--- a/third_party/2and3/typing_extensions.pyi
+++ b/third_party/2and3/typing_extensions.pyi
@@ -98,3 +98,8 @@ _AnnotatedAlias: Any = ...  # undocumented
 
 # TypeAlias is a (non-subscriptable) special form.
 class TypeAlias: ...
+
+@runtime_checkable
+class SupportsIndex(Protocol, metaclass=abc.ABCMeta):
+    @abc.abstractmethod
+    def __index__(self) -> int: ...