 
     result3.notify { syncprint($0) }
 
-    let result4 = result2.combine(result2)
+    let result4 = result2.combine(result1.map { Int($0*4) })
 
     syncprint("Waiting")
     syncprint("Result 1: \(result1.value)")


import swiftiandispatch

let sleeptime = 50_000

class DeferredTests: XCTestCase
{
  func testExample()

    let result1 = async {
      _ -> Double in
      defer { syncprint("Computing result1") }
      return 10.5
    }.delay(ms: 50)

    let result2 = result1.map {
      (d: Double) -> Int in
      syncprint("Computing result2")
      return Int(floor(2*d))
    }.delay(ms: 50)

    let result3 = result1.map {
      (d: Double) -> String in
