       default:
         XCTFail()
       }
+      self.stopMeasuring()
     }
   }
 }

  {
    let iterations = loopTestCount

    measure {
      let inputs = (1...iterations).map { Deferred(value: $0) }
      let c = reduce(inputs, initial: 0, combine: +)
      switch c.result
      {

      default:
        XCTFail()
      }
      self.stopMeasuring()
    }
  }

