The call to `stub_chain` here will fail if used with the `:should` syntax disabled.  Would be good to start with a failing test, then fix it to not call that anymore.  Reading the code, it looks like this line will get hit with a spec like this:

``` ruby
allow(obj).to receive(:foo).and_return(double)
allow(obj).to receive_message_chain(:foo, :bar:, :bazz)
```