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Issue Description:

I was trying to use the `defer` statement in a Playground, and was surprised to find that it never prints anything in the preview pane on the side. I was expecting the evaluation of the code in the `defer` statement to show up in line with the statements, even though they're executed after the last line in the function. I made a very simple playground that modifies a global variable and prints the value in the `defer` statement, and when I print the global variable after calling my function it shows the correct updated value, so the code in the `defer` statement is getting run as expected. Here's my sample code with the Playground output in comments on the side:

var x = 3            // 3
func doSomething() {
  print(1)           // "1\n"
  defer {
      x += 1
      print(x)
  }
  print(2)           // "2\n"
}
doSomething()
print(x)             // "4\n"

I was expecting something like this:

var x = 3            // 3
func doSomething() {
  print(1)           // "1\n"
  defer {
      x += 1         // 4
      print(x)       // "4\n"
  }
  print(2)           // "2\n"
}
doSomething()
print(x)             // "4\n"

The relevant playground is attached to this issue.