Compile and run the following program

  package main

  type S struct {}

  func main() {
      if x := &S{}; true {
          println("true")
      }
  }

  Also available here:

  http://play.golang.org/p/pgwmzxP81l


What do you see instead?

  "prog.go:7:5: expected condition, found simple statement (and 1 more errors)"

  The resolution is to wrap the &S{} in parenthesis. I believe this error message is somwhat opaque and we could do a better job notifying the user about the grammar ambiguity.