diff --git a/Lib/copy_reg.py b/Lib/copy_reg.py
index f499013..169520d 100644
--- a/Lib/copy_reg.py
+++ b/Lib/copy_reg.py
@@ -4,17 +4,12 @@
 C, not for instances of user-defined classes.
 """
 
-from types import ClassType as _ClassType
-
 __all__ = ["pickle", "constructor",
            "add_extension", "remove_extension", "clear_extension_cache"]
 
 dispatch_table = {}
 
 def pickle(ob_type, pickle_function, constructor_ob=None):
-    if type(ob_type) is _ClassType:
-        raise TypeError("copy_reg is not intended for use with classes")
-
     if not callable(pickle_function):
         raise TypeError("reduction functions must be callable")
     dispatch_table[ob_type] = pickle_function
diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index 9bdbb16..dc603be 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -16,7 +16,7 @@
 import string
 import sys
 
-from errors import DistutilsPlatformError
+from .errors import DistutilsPlatformError
 
 # These are needed in a couple of spots, so just compute them once.
 PREFIX = os.path.normpath(sys.prefix)
diff --git a/Lib/encodings/__init__.py b/Lib/encodings/__init__.py
index 01463bc..ddaacb9 100644
--- a/Lib/encodings/__init__.py
+++ b/Lib/encodings/__init__.py
@@ -27,7 +27,8 @@
 
 """#"
 
-import codecs, types, aliases
+import codecs, types
+from . import aliases
 
 _cache = {}
 _unknown = '--unknown--'
diff --git a/Lib/test/test_opcodes.py b/Lib/test/test_opcodes.py
index c192963..742267f 100644
--- a/Lib/test/test_opcodes.py
+++ b/Lib/test/test_opcodes.py
@@ -25,9 +25,9 @@
 
 print '2.2 raise class exceptions'
 
-class AClass: pass
+class AClass(Exception): pass
 class BClass(AClass): pass
-class CClass: pass
+class CClass(Exception): pass
 class DClass(AClass):
     def __init__(self, ignore):
         pass
@@ -58,8 +58,8 @@
     if v != b: raise TestFailed, "v!=b AClass"
 
 # not enough arguments
-try:  raise BClass, a
-except TypeError: pass
+##try:  raise BClass, a
+##except TypeError: pass
 
 try:  raise DClass, a
 except DClass, v: