Function cantConvert

types/conversion.go:723–725

(from TypeID, to TypeID)

}

func cantConvert(from TypeID, to TypeID) error {
	return errors.Errorf("Cannot convert %s to type %s", from.Name(), to.Name())
}

// MarshalJSON makes Val satisfy the json.Marshaler interface.
func (v Val) MarshalJSON() ([]byte, error) {