Function Is

base/errors/stdlib.go:62–62

Is reports whether any error in err's tree matches target. The tree consists of err itself, followed by the errors obtained by repeatedly calling its Unwrap() error or Unwrap() []error method. When err wraps multiple errors, Is examines err followed by a depth-first traversal of its children. An e

(err, target error)

// an example in the standard library. An Is method should only shallowly
// compare err and the target and not call [Unwrap] on either.
func Is(err, target error) bool { return errors.Is(err, target) }

// Join returns an error that wraps the given errors.
// Any nil error values are discarded.