diff --git a/Lib/test/pydocfodder.py b/Lib/test/pydocfodder.py
index 0ae013b..2530320 100644
--- a/Lib/test/pydocfodder.py
+++ b/Lib/test/pydocfodder.py
@@ -1,5 +1,7 @@
 """Something just to look at via pydoc."""
 
+import types
+
 class A_classic:
     "A classic class."
     def A_method(self):
@@ -208,3 +210,7 @@
             del inst.desc[self.attr]
 
     x = property(get_desc('x'), set_desc('x'), del_desc('x'), 'prop x')
+
+
+submodule = types.ModuleType(__name__ + '.submodule',
+    """A submodule, which should appear in its parent's summary""")
diff --git a/Lib/test/test_grp.py b/Lib/test/test_grp.py
index 24b3f00..fb607f0 100755
--- a/Lib/test/test_grp.py
+++ b/Lib/test/test_grp.py
@@ -25,6 +25,9 @@
         for e in entries:
             self.check_value(e)
 
+        if len(entries) > 1000:  # Huge group file (NIS?) -- skip the rest
+            return
+
         for e in entries:
             e2 = grp.getgrgid(e.gr_gid)
             self.check_value(e2)
diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index 5bf7eb0..f6ee371 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -419,6 +419,13 @@
             except OSError:
                 pass
 
+    def test_subclass(self):
+        class anon_mmap(mmap.mmap):
+            def __new__(klass, *args, **kwargs):
+                return mmap.mmap.__new__(klass, -1, *args, **kwargs)
+        anon_mmap(PAGESIZE)
+
+
 def test_main():
     run_unittest(MmapTests)
 
diff --git a/Lib/test/test_pwd.py b/Lib/test/test_pwd.py
index 358b8b3..19187a3 100644
--- a/Lib/test/test_pwd.py
+++ b/Lib/test/test_pwd.py
@@ -35,6 +35,9 @@
             entriesbyname.setdefault(e.pw_name, []).append(e)
             entriesbyuid.setdefault(e.pw_uid, []).append(e)
 
+        if len(entries) > 1000:  # Huge passwd file (NIS?) -- skip the rest
+            return
+
         # check whether the entry returned by getpwuid()
         # for each uid is among those from getpwall() for this uid
         for e in entries:
diff --git a/Lib/test/test_structmembers.py b/Lib/test/test_structmembers.py
index 93d7bfb..27b4b70 100644
--- a/Lib/test/test_structmembers.py
+++ b/Lib/test/test_structmembers.py
@@ -8,52 +8,59 @@
 import warnings, unittest, sys
 from test import test_support
 
-ts=test_structmembersType(1,2,3,4,5,6,7,8,9.99999,10.1010101010)
+ts=test_structmembersType(False, 1, 2, 3, 4, 5, 6, 7, 8,
+                          9.99999, 10.1010101010)
 
 class ReadWriteTests(unittest.TestCase):
     def test_types(self):
-        ts.T_BYTE=CHAR_MAX
+        ts.T_BOOL = True
+        self.assertEquals(ts.T_BOOL, True)
+        ts.T_BOOL = False
+        self.assertEquals(ts.T_BOOL, False)
+        self.assertRaises(TypeError, setattr, ts, 'T_BOOL', 1)
+
+        ts.T_BYTE = CHAR_MAX
         self.assertEquals(ts.T_BYTE, CHAR_MAX)
-        ts.T_BYTE=CHAR_MIN
+        ts.T_BYTE = CHAR_MIN
         self.assertEquals(ts.T_BYTE, CHAR_MIN)
-        ts.T_UBYTE=UCHAR_MAX
+        ts.T_UBYTE = UCHAR_MAX
         self.assertEquals(ts.T_UBYTE, UCHAR_MAX)
 
-        ts.T_SHORT=SHRT_MAX
+        ts.T_SHORT = SHRT_MAX
         self.assertEquals(ts.T_SHORT, SHRT_MAX)
-        ts.T_SHORT=SHRT_MIN
+        ts.T_SHORT = SHRT_MIN
         self.assertEquals(ts.T_SHORT, SHRT_MIN)
-        ts.T_USHORT=USHRT_MAX
+        ts.T_USHORT = USHRT_MAX
         self.assertEquals(ts.T_USHORT, USHRT_MAX)
 
-        ts.T_INT=INT_MAX
+        ts.T_INT = INT_MAX
         self.assertEquals(ts.T_INT, INT_MAX)
-        ts.T_INT=INT_MIN
+        ts.T_INT = INT_MIN
         self.assertEquals(ts.T_INT, INT_MIN)
-        ts.T_UINT=UINT_MAX
+        ts.T_UINT = UINT_MAX
         self.assertEquals(ts.T_UINT, UINT_MAX)
 
-        ts.T_LONG=LONG_MAX
+        ts.T_LONG = LONG_MAX
         self.assertEquals(ts.T_LONG, LONG_MAX)
-        ts.T_LONG=LONG_MIN
+        ts.T_LONG = LONG_MIN
         self.assertEquals(ts.T_LONG, LONG_MIN)
-        ts.T_ULONG=ULONG_MAX
+        ts.T_ULONG = ULONG_MAX
         self.assertEquals(ts.T_ULONG, ULONG_MAX)
 
         ## T_LONGLONG and T_ULONGLONG may not be present on some platforms
         if hasattr(ts, 'T_LONGLONG'):
-            ts.T_LONGLONG=LLONG_MAX
+            ts.T_LONGLONG = LLONG_MAX
             self.assertEquals(ts.T_LONGLONG, LLONG_MAX)
-            ts.T_LONGLONG=LLONG_MIN
+            ts.T_LONGLONG = LLONG_MIN
             self.assertEquals(ts.T_LONGLONG, LLONG_MIN)
 
-            ts.T_ULONGLONG=ULLONG_MAX
+            ts.T_ULONGLONG = ULLONG_MAX
             self.assertEquals(ts.T_ULONGLONG, ULLONG_MAX)
 
             ## make sure these will accept a plain int as well as a long
-            ts.T_LONGLONG=3
+            ts.T_LONGLONG = 3
             self.assertEquals(ts.T_LONGLONG, 3)
-            ts.T_ULONGLONG=4
+            ts.T_ULONGLONG = 4
             self.assertEquals(ts.T_ULONGLONG, 4)
 
 
@@ -63,32 +70,32 @@
 
     def test_byte_max(self):
         with test_support.catch_warning() as w:
-            ts.T_BYTE=CHAR_MAX+1
+            ts.T_BYTE = CHAR_MAX+1
             self.has_warned(w)
 
     def test_byte_min(self):
         with test_support.catch_warning() as w:
-            ts.T_BYTE=CHAR_MIN-1
+            ts.T_BYTE = CHAR_MIN-1
             self.has_warned(w)
 
     def test_ubyte_max(self):
         with test_support.catch_warning() as w:
-            ts.T_UBYTE=UCHAR_MAX+1
+            ts.T_UBYTE = UCHAR_MAX+1
             self.has_warned(w)
 
     def test_short_max(self):
         with test_support.catch_warning() as w:
-            ts.T_SHORT=SHRT_MAX+1
+            ts.T_SHORT = SHRT_MAX+1
             self.has_warned(w)
 
     def test_short_min(self):
         with test_support.catch_warning() as w:
-            ts.T_SHORT=SHRT_MIN-1
+            ts.T_SHORT = SHRT_MIN-1
             self.has_warned(w)
 
     def test_ushort_max(self):
         with test_support.catch_warning() as w:
-            ts.T_USHORT=USHRT_MAX+1
+            ts.T_USHORT = USHRT_MAX+1
             self.has_warned(w)
 
 
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 5dd3aea..1ce5950 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -236,6 +236,24 @@
             """])
         self.assertEqual(rc, 42)
 
+    def test_enumerate_after_join(self):
+        # Try hard to trigger #1703448: a thread is still returned in
+        # threading.enumerate() after it has been join()ed.
+        enum = threading.enumerate
+        old_interval = sys.getcheckinterval()
+        sys.setcheckinterval(1)
+        try:
+            for i in range(1, 1000):
+                t = threading.Thread(target=lambda: None)
+                t.start()
+                t.join()
+                l = enum()
+                self.assertFalse(t in l,
+                    "#1703448 triggered after %d trials: %s" % (i, l))
+        finally:
+            sys.setcheckinterval(old_interval)
+
+
 class ThreadingExceptionTests(unittest.TestCase):
     # A RuntimeError should be raised if Thread.start() is called
     # multiple times.