From 3814a911aa6953a5aefbe8150d280d3a20747d6d Mon Sep 17 00:00:00 2001
From: Nick Coghlan <ncoghlan@gmail.com>
Date: Fri, 2 Nov 2007 10:09:12 +0000
Subject: [PATCH] Fix for bug 1705170 - contextmanager swallowing StopIteration
 (2.5 backport candidate)

---
 Lib/contextlib.py     |  4 ++++
 Lib/test/test_with.py | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/Lib/contextlib.py b/Lib/contextlib.py
index 4f83ef6f32f..dbd1c5744d7 100644
--- a/Lib/contextlib.py
+++ b/Lib/contextlib.py
@@ -25,6 +25,10 @@ class GeneratorContextManager(object):
             else:
                 raise RuntimeError("generator didn't stop")
         else:
+            if value is None:
+                # Need to force instantiation so we can reliably
+                # tell if we get the same exception back
+                value = type()
             try:
                 self.gen.throw(type, value, traceback)
                 raise RuntimeError("generator didn't stop after throw()")
diff --git a/Lib/test/test_with.py b/Lib/test/test_with.py
index 57505085dd3..8242c912c52 100644
--- a/Lib/test/test_with.py
+++ b/Lib/test/test_with.py
@@ -440,6 +440,7 @@ class ExceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
         self.assertAfterWithGeneratorInvariantsNoError(self.bar)
 
     def testRaisedStopIteration1(self):
+        # From bug 1462485
         @contextmanager
         def cm():
             yield
@@ -451,6 +452,7 @@ class ExceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
         self.assertRaises(StopIteration, shouldThrow)
 
     def testRaisedStopIteration2(self):
+        # From bug 1462485
         class cm(object):
             def __enter__(self):
                 pass
@@ -463,7 +465,21 @@ class ExceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
 
         self.assertRaises(StopIteration, shouldThrow)
 
+    def testRaisedStopIteration3(self):
+        # Another variant where the exception hasn't been instantiated
+        # From bug 1705170
+        @contextmanager
+        def cm():
+            yield
+
+        def shouldThrow():
+            with cm():
+                raise iter([]).next()
+
+        self.assertRaises(StopIteration, shouldThrow)
+
     def testRaisedGeneratorExit1(self):
+        # From bug 1462485
         @contextmanager
         def cm():
             yield
@@ -475,6 +491,7 @@ class ExceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
         self.assertRaises(GeneratorExit, shouldThrow)
 
     def testRaisedGeneratorExit2(self):
+        # From bug 1462485
         class cm (object):
             def __enter__(self):
                 pass