func newBasic(kind Kind, obj Object) *Type {
	t := newType(kind)
	t.obj = obj
	return t
}

// NewInterface returns a new interface for the given methods and
// embedded types. Embedded types are specified as fields with no Sym.
func NewInterface(methods []*Field) *Type {
	t := newType(TINTER)
	t.SetInterface(methods)
	for _, f := range methods {