Sample code for rust-server would not compile

Description

I am learning to use swagger-codegen for rust. Surprised to see the generated code from sample petstore would not compile:

samples/server/petstore/rust-server$ cargo build --example client
. . .
Compiling swagger v0.10.0
Compiling petstore_api v1.0.0 (file:///tmp/samples/server/petstore/rust-server)
error[E0412]: cannot find type object in this scope
--> src/lib.rs:297:56
|
297 | fn test_inline_additional_properties(&self, param: object, context: &Context) -> Box<Future<Item=TestInlineAdditionalPropertiesResponse, Error=ApiError>>;
| ^^^^^^ not found in this scope

error[E0412]: cannot find type object in this scope
--> src/lib.rs:398:56
|
398 | fn test_inline_additional_properties(&self, param: object) -> Box<Future<Item=TestInlineAdditionalPropertiesResponse, Error=ApiError>>;
| ^^^^^^ not found in this scope

error[E0412]: cannot find type object in this scope
--> src/lib.rs:528:56
|
528 | fn test_inline_additional_properties(&self, param: object) -> Box<Future<Item=TestInlineAdditionalPropertiesResponse, Error=ApiError>> {
| ^^^^^^ not found in this scope

error[E0412]: cannot find type object in this scope
--> src/client/mod.rs:979:62

Swagger-codegen version

latest: Building swagger-codegen-project 2.4.0-SNAPSHOT
Also tried swagger-codegen-2.3.1, same issue

Swagger declaration file content or url

Command line used for generation

2072 git init
2073 git pull git@github.com:swagger-api/swagger-codegen.git
2074 git pull https://github.com/swagger-api/swagger-codegen.git
2075 ls
2076 ./bin/rust-server-petstore.sh
2098 cd samples/
2099 ls
2100 cd server/
2101 ls
2102 cd petstore
2103 ls
2104 cd rust-server/
2105 ls
2106 ll
2107 cargo build --example client
2108 history

Reproduce the failure from samples/server/petstore/rust-server with cargo build --example client. Inspect the reported signatures in src/lib.rs and src/client/mod.rs and trace them back to the generated sample; done means the rust-server petstore example compiles successfully.