type Mutex struct         { /* Mutex fields */ }
func (m *Mutex) Lock()    { /* Lock implementation */ }
func (m *Mutex) Unlock()  { /* Unlock implementation */ }

// NewMutex has the same composition as Mutex but its method set is empty.
type NewMutex Mutex

// The method set of PtrMutex's underlying type *Mutex remains unchanged,
// but the method set of PtrMutex is empty.
type PtrMutex *Mutex

	TST	$0xffffffad, R4     // TST $4294967213, R4       // 52b0e0e30b0014e1
	TEQ	$0xffffffae, R5     // TEQ $4294967214, R5       // 51b0e0e30b0035e1

// immediate decomposition
	ADD	$0xff0000ff, R0, R1 // ADD $4278190335, R0, R1 // ff1080e2ff1481e2
	EOR	$0xff0000ff, R0, R1 // EOR $4278190335, R0, R1 // ff1020e2ff1421e2
	ORR	$0xff0000ff, R0, R1 // ORR $4278190335, R0, R1 // ff1080e3ff1481e3

type Mutex struct         { /* Mutex fields */ }
func (m *Mutex) Lock()    { /* Lock implementation */ }
func (m *Mutex) Unlock()  { /* Unlock implementation */ }

// NewMutex has the same composition as Mutex but its method set is empty.
type NewMutex Mutex

// The method set of PtrMutex's underlying type *Mutex remains unchanged,
// but the method set of PtrMutex is empty.
type PtrMutex *Mutex