gistfile1.txt

type ExportedType struct {
	unguarded int

	// iternal state that is subject to concurrent access and requires locking
	protected struct {
		sync.RWMutex
		guarded1 int
		guarded2 int
		guarded3 int
	}
}

func (e *ExportedType) Method() {
	e.protected.Lock()
	defer e.protected.Unlock()
	// monkey with e.protected
}