Given an error chain that may contain *PathError, which use of errors.As is correct?

Given an error chain that may contain *PathError, which use of errors.As is correct?

1. var target *PathError; errors.As(err, &target)
2. target := PathError{}; errors.As(err, target)
3. var target **PathError; errors.As(err, target)
4. errors.As(err, PathError{})