return err
	}

	if err := installDevice(appdir); err != nil {
		return err
	}

	if err := mountDevImage(); err != nil {
		return err
	}

	// Kill any hanging debug bridges that might take up port 3222.
	exec.Command("killall", "idevicedebugserverproxy").Run()

	closer, err := startDebugBridge()
	if err != nil {
		return err
	}
	defer closer()

allowing a racing thread to read 1 as well.
</p>

<p>
Note that all these optimizations are permitted in C/C++ compilers:
a Go compiler sharing a back end with a C/C++ compiler must take care
to disable optimizations that are invalid for Go.
</p>

<p>
Note that the prohibition on introducing data races
does not apply if the compiler can prove that the races