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diff --git a/third_party/protobuf/3.6.0/python/google/protobuf/pyext/descriptor.h b/third_party/protobuf/3.6.0/python/google/protobuf/pyext/descriptor.h
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: petar@google.com (Petar Petrov)
+
+#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
+#define GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__
+
+#include <Python.h>
+
+#include <google/protobuf/descriptor.h>
+
+namespace google {
+namespace protobuf {
+namespace python {
+
+extern PyTypeObject PyMessageDescriptor_Type;
+extern PyTypeObject PyFieldDescriptor_Type;
+extern PyTypeObject PyEnumDescriptor_Type;
+extern PyTypeObject PyEnumValueDescriptor_Type;
+extern PyTypeObject PyFileDescriptor_Type;
+extern PyTypeObject PyOneofDescriptor_Type;
+extern PyTypeObject PyServiceDescriptor_Type;
+extern PyTypeObject PyMethodDescriptor_Type;
+
+// Wraps a Descriptor in a Python object.
+// The C++ pointer is usually borrowed from the global DescriptorPool.
+// In any case, it must stay alive as long as the Python object.
+// Returns a new reference.
+PyObject* PyMessageDescriptor_FromDescriptor(const Descriptor* descriptor);
+PyObject* PyFieldDescriptor_FromDescriptor(const FieldDescriptor* descriptor);
+PyObject* PyEnumDescriptor_FromDescriptor(const EnumDescriptor* descriptor);
+PyObject* PyEnumValueDescriptor_FromDescriptor(
+    const EnumValueDescriptor* descriptor);
+PyObject* PyOneofDescriptor_FromDescriptor(const OneofDescriptor* descriptor);
+PyObject* PyFileDescriptor_FromDescriptor(
+    const FileDescriptor* file_descriptor);
+PyObject* PyServiceDescriptor_FromDescriptor(
+    const ServiceDescriptor* descriptor);
+PyObject* PyMethodDescriptor_FromDescriptor(
+    const MethodDescriptor* descriptor);
+
+// Alternate constructor of PyFileDescriptor, used when we already have a
+// serialized FileDescriptorProto that can be cached.
+// Returns a new reference.
+PyObject* PyFileDescriptor_FromDescriptorWithSerializedPb(
+    const FileDescriptor* file_descriptor, PyObject* serialized_pb);
+
+// Return the C++ descriptor pointer.
+// This function checks the parameter type; on error, return NULL with a Python
+// exception set.
+const Descriptor* PyMessageDescriptor_AsDescriptor(PyObject* obj);
+const FieldDescriptor* PyFieldDescriptor_AsDescriptor(PyObject* obj);
+const EnumDescriptor* PyEnumDescriptor_AsDescriptor(PyObject* obj);
+const FileDescriptor* PyFileDescriptor_AsDescriptor(PyObject* obj);
+const ServiceDescriptor* PyServiceDescriptor_AsDescriptor(PyObject* obj);
+const MethodDescriptor* PyMethodDescriptor_AsDescriptor(PyObject* obj);
+
+// Returns the raw C++ pointer.
+const void* PyDescriptor_AsVoidPtr(PyObject* obj);
+
+// Check that the calling Python code is the global scope of a _pb2.py module.
+// This function is used to support the current code generated by the proto
+// compiler, which insists on modifying descriptors after they have been
+// created.
+//
+// stacklevel indicates which Python frame should be the _pb2.py module.
+//
+// Don't use this function outside descriptor classes.
+bool _CalledFromGeneratedFile(int stacklevel);
+
+bool InitDescriptor();
+
+}  // namespace python
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_PYTHON_CPP_DESCRIPTOR_H__