const reflect.SendDir

8 uses

	reflect (current package)
		type.go#L372: 	SendDir                                 // chan<-
		type.go#L373: 	BothDir = RecvDir | SendDir             // chan
		type.go#L1033: 	case SendDir:
		type.go#L1861: 	case SendDir:
		value.go#L1186: 	if ChanDir(tt.Dir)&SendDir == 0 {
		value.go#L2133: 	if ChanDir(tt.Dir)&SendDir == 0 {
		value.go#L2978: 			if ChanDir(tt.Dir)&SendDir == 0 {

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