text: """Implementation of the 'is_not' operation."""
  
  import operator
  
  from ..lib import core
  
  
  @core
  def is_not(x, y):
      """Implementation of the `is not` operator."""
      return not (x is y)
  
  
  __operation_defaults__ = {
      "name": "is_not",
      "registered_name": "is_not",
      "mapping": is_not,
      "python_implementation": operator.is_not,
  }
  