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The presence or absence of the ``:dedent: 4`` option in the example
.. code-block:: ruby
:dedent: 4
some ruby code
makes no difference for the output due to how ReST handles whitespace.
If it is present, then ReST indent is 3 and the 4 spaces of the code are
stripped by the :dedent: option. If the dedent option is missing, then
the ReST indent is 7 and all whitespace is stripped again.
Add a dummy option to fixate the ReST indent to 3, so adding and
removing of the option in the example has an effect on the output.