anchor.diff:          "function";
           "->";
           "when";
  +        @"//";
           "TeSt";
           "two words"
           ]
  
positive.code:         "with";
          "function";
          "->";
          "when"]
  
      // Check the intial state of the reserved words.
      let initialResult = NHol.printer.reserved_words()
      NUnit.Framework.CollectionAssert.AreEquivalent(initialResult, reserved_words_initial)
  
      let reserved_words_added = [
  
negative.code:     // Add some values.
      NHol.printer.reserve_words ["TeSt"; "two words"]
      let addResult = NHol.printer.reserved_words()
  //    printfn "Reserved words - expected: %A" reserved_words_added
  //    printfn "Reserved words - result: %A" addResult
      NUnit.Framework.CollectionAssert.AreEquivalent(addResult, reserved_words_added)
  
      // Test for one of the added values.
  