Merge commit 'origin/R3_3_branch'

Conflicts:
	CHANGES
	cpp/demo/Freeze/backup/.depend
	cpp/demo/Freeze/bench/.depend
	cpp/demo/Freeze/casino/.depend
	cpp/demo/Freeze/customEvictor/.depend
	cpp/demo/Freeze/library/.depend
	cpp/demo/Freeze/phonebook/.depend
	cpp/demo/Freeze/transform/.depend
	cpp/demo/Glacier2/callback/.depend
	cpp/demo/Glacier2/chat/.depend
	cpp/demo/Ice/async/.depend
	cpp/demo/Ice/bidir/.depend
	cpp/demo/Ice/callback/.depend
	cpp/demo/Ice/converter/.depend
	cpp/demo/Ice/hello/.depend
	cpp/demo/Ice/invoke/.depend
	cpp/demo/Ice/latency/.depend
	cpp/demo/Ice/minimal/.depend
	cpp/demo/Ice/multicast/.depend
	cpp/demo/Ice/nested/.depend
	cpp/demo/Ice/nrvo/.depend
	cpp/demo/Ice/session/.depend
	cpp/demo/Ice/throughput/.depend
	cpp/demo/Ice/value/.depend
	cpp/demo/IceBox/hello/.depend
	cpp/demo/IceGrid/allocate/.depend
	cpp/demo/IceGrid/icebox/.depend
	cpp/demo/IceGrid/replication/.depend
	cpp/demo/IceGrid/sessionActivation/.depend
	cpp/demo/IceGrid/simple/.depend
	cpp/demo/IceStorm/clock/.depend
	cpp/demo/IceStorm/counter/.depend
	cpp/demo/IceStorm/replicated/.depend
	cpp/demo/IceStorm/replicated2/.depend
	cpp/demo/book/freeze_filesystem/.depend
	cpp/demo/book/lifecycle/.depend
	cpp/demo/book/printer/.depend
	cpp/demo/book/simple_filesystem/.depend
	cpp/src/Freeze/.depend
	cpp/src/FreezeScript/.depend
	cpp/src/Ice/.depend
	cpp/src/Ice/UdpTransceiver.cpp
	cpp/src/Ice/UdpTransceiver.h
	cpp/src/IceBox/.depend
	cpp/src/IceGrid/.depend
	cpp/src/IceGridLib/.depend
	cpp/src/IcePatch2/.depend
	cpp/src/IceStorm/.depend
	cpp/src/slice2freeze/.depend
	cpp/test/Freeze/complex/.depend
	cpp/test/Freeze/dbmap/.depend
	cpp/test/Freeze/evictor/.depend
	cpp/test/Freeze/oldevictor/.depend
	cpp/test/FreezeScript/dbmap/.depend
	cpp/test/FreezeScript/evictor/.depend
	cpp/test/Glacier2/attack/.depend
	cpp/test/Glacier2/dynamicFiltering/.depend
	cpp/test/Glacier2/router/.depend
	cpp/test/Glacier2/sessionControl/.depend
	cpp/test/Glacier2/ssl/.depend
	cpp/test/Glacier2/staticFiltering/.depend
	cpp/test/Ice/adapterDeactivation/.depend
	cpp/test/Ice/background/.depend
	cpp/test/Ice/binding/.depend
	cpp/test/Ice/checksum/.depend
	cpp/test/Ice/checksum/server/.depend
	cpp/test/Ice/custom/.depend
	cpp/test/Ice/exceptions/.depend
	cpp/test/Ice/facets/.depend
	cpp/test/Ice/faultTolerance/.depend
	cpp/test/Ice/gc/.depend
	cpp/test/Ice/hold/.depend
	cpp/test/Ice/inheritance/.depend
	cpp/test/Ice/interceptor/.depend
	cpp/test/Ice/location/.depend
	cpp/test/Ice/objects/.depend
	cpp/test/Ice/operations/.depend
	cpp/test/Ice/proxy/.depend
	cpp/test/Ice/retry/.depend
	cpp/test/Ice/servantLocator/.depend
	cpp/test/Ice/slicing/exceptions/.depend
	cpp/test/Ice/slicing/objects/.depend
	cpp/test/Ice/stream/.depend
	cpp/test/Ice/stringConverter/.depend
	cpp/test/Ice/timeout/.depend
	cpp/test/Ice/udp/.depend
	cpp/test/IceBox/configuration/.depend
	cpp/test/IceGrid/activation/.depend
	cpp/test/IceGrid/allocation/.depend
	cpp/test/IceGrid/deployer/.depend
	cpp/test/IceGrid/distribution/.depend
	cpp/test/IceGrid/replicaGroup/.depend
	cpp/test/IceGrid/replication/.depend
	cpp/test/IceGrid/session/.depend
	cpp/test/IceGrid/simple/.depend
	cpp/test/IceGrid/update/.depend
	cpp/test/IceSSL/configuration/.depend
	cpp/test/IceStorm/federation/.depend
	cpp/test/IceStorm/federation2/.depend
	cpp/test/IceStorm/rep1/.depend
	cpp/test/IceStorm/repgrid/.depend
	cpp/test/IceStorm/repstress/.depend
	cpp/test/IceStorm/single/.depend
	cpp/test/IceStorm/stress/.depend
	cpp/test/Slice/keyword/.depend
	cs/src/Ice/Instance.cs
	cs/src/IceSSL/ConnectorI.cs
	java/demo/book/simple_filesystem/Filesystem/DirectoryI.java
	java/demo/book/simple_filesystem/Filesystem/FileI.java
	java/src/IceInternal/TcpConnector.java
	java/src/IceSSL/ConnectorI.java
	py/modules/IcePy/.depend
	rb/src/IceRuby/.depend

1 files changed, 7 insertions, 0 deletions

diff --git a/py/python/Ice.py b/py/python/Ice.py
index 864315974f1..9689dbabc88 100644
--- a/py/python/Ice.py
+++ b/py/python/Ice.py
@@ -28,6 +28,13 @@ generateUUID = IcePy.generateUUID
 loadSlice = IcePy.loadSlice
 
 #
+# This value is used as the default value for struct types in the constructors
+# of user-defined types. It allows us to determine whether the application has
+# supplied a value. (See bug 3676)
+#
+_struct_marker = object()
+
+#
 # Core Ice types.
 #
 class Object(object):