of an interface type or of elements of a composite type remains unchanged:
</p>

<pre>
// A Mutex is a data type with two methods, Lock and Unlock.
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

pkg syscall (darwin-arm64), const IMAXBEL ideal-int
pkg syscall (darwin-arm64), const INLCR = 64
pkg syscall (darwin-arm64), const INLCR ideal-int
pkg syscall (darwin-arm64), const INPCK = 16
pkg syscall (darwin-arm64), const INPCK ideal-int
pkg syscall (darwin-arm64), const IN_CLASSA_HOST = 16777215
pkg syscall (darwin-arm64), const IN_CLASSA_HOST ideal-int
pkg syscall (darwin-arm64), const IN_CLASSA_MAX = 128

pkg syscall (netbsd-arm64-cgo), const IN_LOOPBACKNET = 127
pkg syscall (netbsd-arm64-cgo), const IN_LOOPBACKNET ideal-int
pkg syscall (netbsd-arm64-cgo), const INPCK = 16
pkg syscall (netbsd-arm64-cgo), const INPCK ideal-int
pkg syscall (netbsd-arm64-cgo), const IP_ADD_MEMBERSHIP = 12
pkg syscall (netbsd-arm64-cgo), const IP_DEFAULT_MULTICAST_LOOP = 1