docs: def fail(state, msg="fail"):
      """Always fails the SCT, with an optional msg.
  
      This function takes a single argument, ``msg``, that is the feedback given to the student.
      Note that this would be a terrible idea for grading submissions, but may be useful while writing SCTs.
      For example, failing a test will highlight the code as if the previous test/check had failed.
      """
      _msg = state.build_message(msg)
      state.report(Feedback(_msg, state))
  
      return state