mvcc/watcher_group.go
func (wg *watcherGroup) contains(key string) bool {
	_, ok := wg.keyWatchers[key]
	return ok || wg.ranges.Intersects(adt.NewStringAffinePoint(key))
}
func (wg *watcherGroup) contains(key string) bool {
	_, ok := wg.keyWatchers[key]
	return ok || wg.ranges.Intersects(adt.NewStringAffinePoint(key))
}
func ( wg * watcherGroup ) contains ( key string ) bool { _ , ok := wg . keyWatchers [ key ] return ok || wg . ranges . Intersects ( adt . NewStringAffinePoint ( key ) ) }
// contains is whether the given key has a watcher in the group.
contains is whether the given key has a watcher in the group .