message: [Swift] Add test for small resilient global variable
diff: @@ -17,4 +17,7 @@ func main() {
  //% self.expect("expression -d run -- url", substrs=['www.apple.com'])
  }
  -main()
  +var g_url = URL(string: "http://www.apple.com")!
  +
  +main() //% self.expect("target variable g_url", substrs=['www.apple.com'])
  + //% self.expect("expression -d run -- g_url", substrs=['www.apple.com'])
  