[O] Ruby babel src block does not run some code

[address@hidden]

For example, I have a ruby src block like this:

```

#+BEGIN_SRC ruby

  module A

    CREF = "*** CREF in module A"

  end 

  module A

    module B

      puts CREF

    end

  end

#+END_SRC

```

And press `[C-c C-c]` to execute, get this error:

```

#+BEGIN_EXAMPLE

-:3: module definition in method body

-:4: dynamic constant assignment

  CREF = "*** CREF in module A"

        ^

-:7: module definition in method body

-:8: module definition in method body

#+END_EXAMPLE

```

My emacs version: 24.5.1

My org-mode version: 8.3.4 (installed from MELPA)

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