var a string

func f() {
	a = "hello, world"
	l.Unlock()
}

func main() {
	l.Lock()
	go f()
	l.Lock()
	print(a)
}
</pre>

<p>
is guaranteed to print <code>"hello, world"</code>.
The first call to <code>l.Unlock()</code> (in <code>f</code>) is synchronized
before the second call to <code>l.Lock()</code> (in <code>main</code>) returns,
which is sequenced before the <code>print</code>.
</p>

	STP	(R26, R27), 700(R2)                              // ERROR "cannot use REGTMP as source"
	MOVK	$0, R10                                          // ERROR "zero shifts cannot be handled correctly"
	MOVK	$(0<<32), R10                                    // ERROR "zero shifts cannot be handled correctly"
	TLBI	PLDL1KEEP                                        // ERROR "illegal argument"