Function Cause

functions.go:203–212

Cause returns the cause of the given error. This will be either the original error, or the result of a Wrap or Mask call. Cause is the usual way to diagnose errors that may have been wrapped by the other errors functions.

(err error)

// Cause is the usual way to diagnose errors that may have been wrapped by
// the other errors functions.
func Cause(err error) error {
	var diag error
	if err, ok := err.(causer); ok {
		diag = err.Cause()
	}
	if diag != nil {
		return diag
	}
	return err
}

type causer interface {
	Cause() error