title: Swift 3 UnsafePointer($0) no longer compile in Xcode 8 beta 6
body: <p>My code snipet as follows …:</p>
  
  <pre><code>    let defaultRouteReachability = withUnsafePointer(to: &amp;zeroAddress) {
          SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
      }
  </code></pre>
  
  <p>… does no longer compile with the following error which I don't understand:</p>
  
  <pre><code>"'init' is unavailable: use 'withMemoryRebound(to:capacity:_)' to temporarily view memory as another layout-compatible type."
  </code></pre>
  
  <p>What to do to fix it?</p>