Capture defer error

catch.go

type Capture struct{
  closer *Closer
  err error
}

func (cap Capture) Close() error {
  cap.err = cap.closer.Close()
  return cap.err
}

func DoSomething(cl *ReadCloser) (thing, error) {
  var cap = Capture{cl, nil}
  defer cap.Close()
  out, err := GetThing(cl, "something")
  if err != nil {
    return nil, err
  }
  return out, cap.err
}
  

See http://blog.golang.org/defer-panic-and-recover, doesn't work.