func E(format string, a ...interface{}) error {
	return Safe(fmt.Errorf(format, a...))
}
func E(format string, a ...interface{}) error {
	return Safe(fmt.Errorf(format, a...))
}
func E ( format string , a ... interface { } ) error { return Safe ( fmt . Errorf ( format , a ... ) ) }
// E is a short-hand function to construct a safe error.
E is a short - hand function to construct a safe error .