Merged revisions 60481,60485,60489-60492,60494-60496,60498-60499,60501-60503,60505-60506,60508-60509,60523-60524,60532,60543,60545,60547-60548,60552,60554,60556-60559,60561-60562,60569,60571-60572,60574,60576-60583,60585-60586,60589,60591,60594-60595,60597-60598,60600-60601,60606-60612,60615,60617,60619-60621,60623-60625,60627-60629,60631,60633,60635,60647,60650,60652,60654,60656,60658-60659,60664-60666,60668-60670,60672,60676,60678-60695 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r60679 | raymond.hettinger | 2008-02-09 02:18:42 +0100 (Sat, 09 Feb 2008) | 1 line

  Make ABC containers inherit as documented.
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  r60684 | raymond.hettinger | 2008-02-09 04:34:52 +0100 (Sat, 09 Feb 2008) | 1 line

  Merge with r60683.
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  r60687 | raymond.hettinger | 2008-02-09 05:37:49 +0100 (Sat, 09 Feb 2008) | 1 line

  Add -3 warnings that set.copy(), dict.copy(), and defaultdict.copy() will go away in Py3.x
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  r60689 | raymond.hettinger | 2008-02-09 11:04:19 +0100 (Sat, 09 Feb 2008) | 1 line

  Metaclass declaration is inherited
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  r60691 | raymond.hettinger | 2008-02-09 11:06:20 +0100 (Sat, 09 Feb 2008) | 1 line

  Temporarily disable this test. It's been broken for a week.
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  r60695 | nick.coghlan | 2008-02-09 16:28:09 +0100 (Sat, 09 Feb 2008) | 1 line

  Issue 2021: Allow NamedTemporaryFile and SpooledTemporaryFile to be used as context managers. (The NamedTemporaryFile fix should be considered for backporting to 2.5)
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1 files changed, 1 insertions, 0 deletions

diff --git a/Lib/io.py b/Lib/io.py
index e427fe6..01c31a9 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -365,6 +365,7 @@ class IOBase(metaclass=abc.ABCMeta):
 
     def __enter__(self) -> "IOBase":  # That's a forward reference
         """Context management protocol.  Returns self."""
+        self._checkClosed()
         return self
 
     def __exit__(self, *args) -> None: