Kablooie closure and delaysec keyword

gistfile1.cs

img label = img.Label;
float waitSeconds = 4;
delaysec(waitSeconds)
{
   label.SetTextWithKnownChars("Done waiting now.");
   delaysec(waitSeconds)
   {
      // Execution of this line is delayed by (2 * waitSeconds).
      label.SetTextWithKnownChars("Ha, just kidding, actually waited some more.");
   }
}
// Execution continues here without stopping, so this is the first message shown.
label.SetTextWithKnownChars("Please wait...");