BothDir            = RecvDir | SendDir // chan
	InvalidDir ChanDir = 0
)

// ChanType represents a channel type
type ChanType struct {
	Type
	Elem *Type
	Dir  ChanDir
}

type structTypeUncommon struct {
	StructType
	u UncommonType
}

// ChanDir returns the direction of t if t is a channel type, otherwise InvalidDir (0).
func (t *Type) ChanDir() ChanDir {
	if t.Kind() == Chan {