SF patch 518765 (Derek Harland): Bug in copy.py when used through
rexec.

When using a restricted environment, imports of copy will fail with an
AttributeError when trying to access types.CodeType.

Bugfix candidate (all the way back to 1.5.3, but at least 2.1.3 and
2.2.1).
diff --git a/Lib/copy.py b/Lib/copy.py
index 86fc978..cf0b1af 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -197,7 +197,10 @@
     d[types.UnicodeType] = _deepcopy_atomic
 except AttributeError:
     pass
-d[types.CodeType] = _deepcopy_atomic
+try:
+    d[types.CodeType] = _deepcopy_atomic
+except AttributeError:
+    pass
 d[types.TypeType] = _deepcopy_atomic
 d[types.XRangeType] = _deepcopy_atomic
 
diff --git a/Misc/ACKS b/Misc/ACKS
index 9a49b86..51780d8 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -176,6 +176,7 @@
 Stephen Hansen
 Barry Hantman
 Lynda Hardman
+Derek Harland
 Jason Harper
 Gerhard Häring
 Larry Hastings