//
	// ITab is only used for assertions (including type switches) from
	// non-empty interface type to a concrete (i.e., non-interface)
	// type. For all other assertions, ITab is nil.
	ITab Node
}

func NewDynamicType(pos src.XPos, rtype Node) *DynamicType {
	n := &DynamicType{RType: rtype}
	n.pos = pos
	n.op = ODYNAMICTYPE
	return n