Manually set input as clock by setting the CLOCK attribute
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

The following shows that ``input wire a`` is given the ``(* CLOCK *)`` attribute.

.. symbolator:: ../../../tests/clocks/input_attr_clock/input_attr_clock.sim.v

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.. literalinclude:: ../../../tests/clocks/input_attr_clock/input_attr_clock.sim.v
   :language: verilog
   :start-after: */
   :caption: tests/clocks/input_attr_clock/input_attr_clock.sim.v

As such, the ``is_clock`` attribute of the ``a`` port is set to 1.

.. literalinclude:: ../../../tests/clocks/input_attr_clock/golden.model.xml
   :language: xml
   :caption: tests/clocks/input_attr_clock/golden.model.xml