Spooky action at a distance when you don't use self

gistfile1.swift

// Try this in a commandline app vs a playground. The behaviors are different.

class MyClass {
  func doSomething() {
    refresh() // I wonder which refresh we'll get?
  }
}

// Not only does this change the behavior of doSomething()... (see below)
// extension MyClass {
//  func refresh() {
//    println("I'm an extension refresh")
//  }
//}

func refresh() {
  println("I'm the global refresh function.")
}

// ... but it behaves *differently* if it's here
//extension MyClass {
//  func refresh() {
//    println("I'm an extension refresh")
//  }
//}

MyClass().doSomething()

// see also https://gist.github.com/rnapier/4213dc64206b17df6935