build/change_trust.go
func (m Asset) MutateChangeTrust(o *xdr.ChangeTrustOp) (err error) {
	if m.Native {
		return errors.New("Native asset not allowed")
	}

	o.Line, err = m.ToXdrObject()
	return
}
func (m Asset) MutateChangeTrust(o *xdr.ChangeTrustOp) (err error) {
	if m.Native {
		return errors.New("Native asset not allowed")
	}

	o.Line, err = m.ToXdrObject()
	return
}
// MutateChangeTrust for Asset sets the ChangeTrustOp's Line field