t.Fatalf("got %T, want *url.Error", err)
	}
	oe, ok := uerr.Err.(*net.OpError)
	if !ok {
		t.Fatalf("url.Error.Err =  %T; want *net.OpError", uerr.Err)
	}
	want := &net.OpError{
		Op:  "proxyconnect",
		Net: "tcp",
		Err: errDial, // original error, unwrapped.
	}
	if !reflect.DeepEqual(oe, want) {
		t.Errorf("Got error %#v; want %#v", oe, want)
	}
}

	procbind                                                 = modws2_32.NewProc("bind")
	procclosesocket                                          = modws2_32.NewProc("closesocket")
	procconnect                                              = modws2_32.NewProc("connect")
	procgethostbyname                                        = modws2_32.NewProc("gethostbyname")