Patch # 1323 by Amaury Forgeot d'Arc.
This patch corrects a problem in test_file.py on Windows:
f.truncate() seeks to the truncation point, but does not empty the
buffers. In the test, f.tell() returns -1...
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index f2718b2..ab29932 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -181,12 +181,13 @@
             self.assertEquals(d, s)
 
     def testTruncateOnWindows(self):
-        os.unlink(TESTFN)
+        # SF bug <http://www.python.org/sf/801631>
+        # "file.truncate fault on windows"
 
-        def bug801631():
-            # SF bug <http://www.python.org/sf/801631>
-            # "file.truncate fault on windows"
-            f = open(TESTFN, 'wb')
+        os.unlink(TESTFN)
+        f = open(TESTFN, 'wb')
+
+        try:
             f.write(b'12345678901')   # 11 bytes
             f.close()
 
@@ -205,10 +206,8 @@
             size = os.path.getsize(TESTFN)
             if size != 5:
                 self.fail("File size after ftruncate wrong %d" % size)
-
-        try:
-            bug801631()
         finally:
+            f.close()
             os.unlink(TESTFN)
 
     def testIteration(self):