Index: contextlib.py
===================================================================
--- contextlib.py	(revision 43548)
+++ contextlib.py	(working copy)
@@ -32,7 +32,9 @@
                 self.gen.throw(type, value, traceback)
                 raise RuntimeError("generator didn't stop after throw()")
             except StopIteration:
-                return True
+                # Supress the exception unless it's the same exception the
+                # was passed to throw().
+                return sys.exc_info()[1] is not value
             except:
                 # only re-raise if it's *not* the exception that was
                 # passed to throw(), because __exit__() must not raise
Index: test/test_with.py
===================================================================
--- test/test_with.py	(revision 43548)
+++ test/test_with.py	(working copy)
@@ -494,7 +494,63 @@
         self.assertAfterWithGeneratorInvariantsWithError(self.foo)
         self.assertAfterWithGeneratorInvariantsNoError(self.bar)
 
+    def testRaisedStopIteration1(self):
+        @contextmanager
+        def cm():
+            yield
 
+        def shouldThrow():
+            with cm():
+                raise StopIteration("from with")
+
+        self.assertRaises(StopIteration, shouldThrow)
+
+    def testRaisedStopIteration2(self):
+        class cm (object):
+            def __context__(self):
+                return self
+
+            def __enter__(self):
+                pass
+
+            def __exit__(self, type, value, traceback):
+                pass
+
+        def shouldThrow():
+            with cm():
+                raise StopIteration("from with")
+
+        self.assertRaises(StopIteration, shouldThrow)
+
+    def testRaisedGeneratorExit1(self):
+        @contextmanager
+        def cm():
+            yield
+
+        def shouldThrow():
+            with cm():
+                raise GeneratorExit("from with")
+
+        self.assertRaises(GeneratorExit, shouldThrow)
+
+    def testRaisedGeneratorExit2(self):
+        class cm (object):
+            def __context__(self):
+                return self
+
+            def __enter__(self):
+                pass
+
+            def __exit__(self, type, value, traceback):
+                pass
+
+        def shouldThrow():
+            with cm():
+                raise GeneratorExit("from with")
+
+        self.assertRaises(GeneratorExit, shouldThrow)
+
+
 class NonLocalFlowControlTestCase(unittest.TestCase):
 
     def testWithBreak(self):