code: def _validate_classpath_tuples(self, classpath, target):
      
      for classpath_tuple in classpath:
        conf, classpath_entry = classpath_tuple
        path = classpath_entry.path
        if os.path.relpath(path, self._pants_workdir).startswith(os.pardir):
          raise TaskError(
            'Classpath entry {} for target {} is located outside the working directory "{}".'
            .format(path, target.address.spec, self._pants_workdir))
docs: Validates that all files are located within the working directory, to simplify relativization.
  
      :param classpath: The list of classpath tuples. Each tuple is a 2-tuple of ivy_conf and
                        ClasspathEntry.
      :param target: The target that the classpath tuple is being registered for.
      :raises: `TaskError` when the path is outside the work directory