diff --git a/lib/rs/src/autogen.rs b/lib/rs/src/autogen.rs
new file mode 100644
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--- /dev/null
+++ b/lib/rs/src/autogen.rs
@@ -0,0 +1,45 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Thrift compiler auto-generated support.
+//!
+//!
+//! Types and functions used internally by the Thrift compiler's Rust plugin
+//! to implement required functionality. Users should never have to use code
+//! in this module directly.
+
+use ::protocol::{TInputProtocol, TOutputProtocol};
+
+/// Specifies the minimum functionality an auto-generated client should provide
+/// to communicate with a Thrift server.
+pub trait TThriftClient {
+    /// Returns the input protocol used to read serialized Thrift messages
+    /// from the Thrift server.
+    fn i_prot_mut(&mut self) -> &mut TInputProtocol;
+    /// Returns the output protocol used to write serialized Thrift messages
+    /// to the Thrift server.
+    fn o_prot_mut(&mut self) -> &mut TOutputProtocol;
+    /// Returns the sequence number of the last message written to the Thrift
+    /// server. Returns `0` if no messages have been written. Sequence
+    /// numbers should *never* be negative, and this method returns an `i32`
+    /// simply because the Thrift protocol encodes sequence numbers as `i32` on
+    /// the wire.
+    fn sequence_number(&self) -> i32; // FIXME: consider returning a u32
+    /// Increments the sequence number, indicating that a message with that
+    /// number has been sent to the Thrift server.
+    fn increment_sequence_number(&mut self) -> i32;
+}