const internal/abi.BothDir

3 uses

	internal/abi (current package)
		type.go#L299: 	BothDir            = RecvDir | SendDir // chan

	internal/reflectlite
		type.go#L558: 		if V.ChanDir() == abi.BothDir && haveIdenticalType(T.Elem(), V.Elem(), cmpTags) {

	reflect
		type.go#L1508: 	return V.ChanDir() == abi.BothDir && (nameFor(T) == "" || nameFor(V) == "") && haveIdenticalType(T.Elem(), V.Elem(), true)