error.go
func Errorf(format string, a ...interface{}) *Error {
	return Wrap(fmt.Errorf(format, a...), 1)
}
func Errorf(format string, a ...interface{}) *Error {
	return Wrap(fmt.Errorf(format, a...), 1)
}
func Errorf ( format string , a ... interface { } ) * Error { return Wrap ( fmt . Errorf ( format , a ... ) , 1 ) }
// Errorf creates a new error with the given message. You can use it
// as a drop-in replacement for fmt.Errorf() to provide descriptive
// errors in return values.
Errorf creates a new error with the given message . You can use it as a drop - in replacement for fmt . Errorf () to provide descriptive errors in return values .