From d43cea947ff2559954a52a4e7b550610fe4592d6 Mon Sep 17 00:00:00 2001
From: Rebecca Chen <rechen@google.com>
Date: Fri, 4 Oct 2019 14:19:36 -0700
Subject: [PATCH] Fix the signature of IOBase._checkClosed().

* In Python 2, the optional `msg` argument was missing.
* In Python 3, the method was missing altogether.

Reference:
https://github.com/python/cpython/blob/2.7/Lib/_pyio.py#L423
https://github.com/python/cpython/blob/3.6/Lib/_pyio.py#L443
---
 stdlib/2/_io.pyi | 2 +-
 stdlib/3/io.pyi  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/stdlib/2/_io.pyi b/stdlib/2/_io.pyi
index d0185ae7da0c..e8e448f2c8ed 100644
--- a/stdlib/2/_io.pyi
+++ b/stdlib/2/_io.pyi
@@ -16,7 +16,7 @@ _T = TypeVar("_T")
 class _IOBase(BinaryIO):
     @property
     def closed(self) -> bool: ...
-    def _checkClosed(self) -> None: ...
+    def _checkClosed(self, msg: Optional[str] = ...) -> None: ...  # undocumented
     def _checkReadable(self) -> None: ...
     def _checkSeekable(self) -> None: ...
     def _checkWritable(self) -> None: ...
diff --git a/stdlib/3/io.pyi b/stdlib/3/io.pyi
index acab18ca179c..22a8784a755e 100644
--- a/stdlib/3/io.pyi
+++ b/stdlib/3/io.pyi
@@ -45,6 +45,7 @@ class IOBase:
     def __del__(self) -> None: ...
     @property
     def closed(self) -> bool: ...
+    def _checkClosed(self, msg: Optional[str] = ...) -> None: ...  # undocumented
 
 class RawIOBase(IOBase):
     def readall(self) -> bytes: ...