const reflect.SendDir

8 uses

	reflect (current package)
		type.go#L349: 	SendDir                                 // chan<-
		type.go#L350: 	BothDir = RecvDir | SendDir             // chan
		type.go#L961: 	case SendDir:
		type.go#L1788: 	case SendDir:
		value.go#L1181: 	if ChanDir(tt.Dir)&SendDir == 0 {
		value.go#L2106: 	if ChanDir(tt.Dir)&SendDir == 0 {
		value.go#L2909: 			if ChanDir(tt.Dir)&SendDir == 0 {

	text/template
		exec.go#L435: 		if val.Type().ChanDir() == reflect.SendDir {