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  General government gross debt [Percent of GDP]
  Country        Year  2012 2013 2014 2015
  China                  26   23   20   19
  United States         102  104  106  107

  let do_something (thing : Thing.t) (logging : [`With_logging | `No_logging])  =
  ...

  let do_something thing logging =
    let logging_as_bool = 
      match logging with
      | `With_logging -> true
      | `No_logging -> false
    in
    ....