prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Error with TransformationFactory('core.relax_integers')
  When I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.
  
  `WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`
  
  When I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:
  
  ```
  TransformationFactory('core.relax_integers').apply_to(m)
  AttributeError: 'NoneType' object has no attribute 'apply_to'
  ```
  
  
  Error with TransformationFactory('core.relax_integers')
  When I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.
  
  `WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`
  
  When I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:
  
  ```
  TransformationFactory('core.relax_integers').apply_to(m)
  AttributeError: 'NoneType' object has no attribute 'apply_to'
  ```
  
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `pyomo/core/plugins/transform/relax_integrality.py`
  Content:
  ```
  1 #  ___________________________________________________________________________
  2 #
  3 #  Pyomo: Python Optimization Modeling Objects
  4 #  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC
  5 #  Under the terms of Contract DE-NA0003525 with National Technology and
  6 #  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain
  7 #  rights in this software.
  8 #  This software is distributed under the 3-clause BSD License.
  9 #  ___________________________________________________________________________
  10 
  11 from pyomo.common import deprecated
  12 from pyomo.core.base import TransformationFactory
  13 from pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars
  14 
  15 
  16 @TransformationFactory.register(
  17     'core.relax_integrality',
  18     doc="[DEPRECATED] Create a model where integer variables are replaced with "
  19     "real variables.")
  20 class RelaxIntegrality(RelaxIntegerVars):
  21     """
  22     This plugin relaxes integrality in a Pyomo model.
  23     """
  24 
  25     @deprecated(
  26         "core.relax_integrality is deprecated.  Use core.relax_integers",
  27         version='TBD')
  28     def __init__(self, **kwds):
  29         super(RelaxIntegrality, self).__init__(**kwds)
  30
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/pyomo/core/plugins/transform/relax_integrality.py b/pyomo/core/plugins/transform/relax_integrality.py
  --- a/pyomo/core/plugins/transform/relax_integrality.py
  +++ b/pyomo/core/plugins/transform/relax_integrality.py
  @@ -23,7 +23,7 @@
       """
   
       @deprecated(
  -        "core.relax_integrality is deprecated.  Use core.relax_integers",
  +        "core.relax_integrality is deprecated.  Use core.relax_integer_vars",
           version='TBD')
       def __init__(self, **kwds):
           super(RelaxIntegrality, self).__init__(**kwds)
  
verification_info: {"golden_diff": "diff --git a/pyomo/core/plugins/transform/relax_integrality.py b/pyomo/core/plugins/transform/relax_integrality.py\n--- a/pyomo/core/plugins/transform/relax_integrality.py\n+++ b/pyomo/core/plugins/transform/relax_integrality.py\n@@ -23,7 +23,7 @@\n     \"\"\"\n \n     @deprecated(\n-        \"core.relax_integrality is deprecated.  Use core.relax_integers\",\n+        \"core.relax_integrality is deprecated.  Use core.relax_integer_vars\",\n         version='TBD')\n     def __init__(self, **kwds):\n         super(RelaxIntegrality, self).__init__(**kwds)\n", "issue": "Error with TransformationFactory('core.relax_integers')\nWhen I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.\r\n\r\n`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`\r\n\r\nWhen I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:\r\n\r\n```\r\nTransformationFactory('core.relax_integers').apply_to(m)\r\nAttributeError: 'NoneType' object has no attribute 'apply_to'\r\n```\r\n\r\n\nError with TransformationFactory('core.relax_integers')\nWhen I use `TransformationFactory('core.relax_integrality').apply_to(m)`, a warning came up.\r\n\r\n`WARNING: DEPRECATED: core.relax_integrality is deprecated.  Use core.relax_integers  (deprecated in TBD)`\r\n\r\nWhen I changed the code to `TransformationFactory('core.relax_integers').apply_to(m)`, an error came up:\r\n\r\n```\r\nTransformationFactory('core.relax_integers').apply_to(m)\r\nAttributeError: 'NoneType' object has no attribute 'apply_to'\r\n```\r\n\r\n\n", "before_files": [{"content": "#  ___________________________________________________________________________\n#\n#  Pyomo: Python Optimization Modeling Objects\n#  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC\n#  Under the terms of Contract DE-NA0003525 with National Technology and\n#  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n#  rights in this software.\n#  This software is distributed under the 3-clause BSD License.\n#  ___________________________________________________________________________\n\nfrom pyomo.common import deprecated\nfrom pyomo.core.base import TransformationFactory\nfrom pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars\n\n\n@TransformationFactory.register(\n    'core.relax_integrality',\n    doc=\"[DEPRECATED] Create a model where integer variables are replaced with \"\n    \"real variables.\")\nclass RelaxIntegrality(RelaxIntegerVars):\n    \"\"\"\n    This plugin relaxes integrality in a Pyomo model.\n    \"\"\"\n\n    @deprecated(\n        \"core.relax_integrality is deprecated.  Use core.relax_integers\",\n        version='TBD')\n    def __init__(self, **kwds):\n        super(RelaxIntegrality, self).__init__(**kwds)\n", "path": "pyomo/core/plugins/transform/relax_integrality.py"}], "after_files": [{"content": "#  ___________________________________________________________________________\n#\n#  Pyomo: Python Optimization Modeling Objects\n#  Copyright 2017 National Technology and Engineering Solutions of Sandia, LLC\n#  Under the terms of Contract DE-NA0003525 with National Technology and\n#  Engineering Solutions of Sandia, LLC, the U.S. Government retains certain\n#  rights in this software.\n#  This software is distributed under the 3-clause BSD License.\n#  ___________________________________________________________________________\n\nfrom pyomo.common import deprecated\nfrom pyomo.core.base import TransformationFactory\nfrom pyomo.core.plugins.transform.discrete_vars import RelaxIntegerVars\n\n\n@TransformationFactory.register(\n    'core.relax_integrality',\n    doc=\"[DEPRECATED] Create a model where integer variables are replaced with \"\n    \"real variables.\")\nclass RelaxIntegrality(RelaxIntegerVars):\n    \"\"\"\n    This plugin relaxes integrality in a Pyomo model.\n    \"\"\"\n\n    @deprecated(\n        \"core.relax_integrality is deprecated.  Use core.relax_integer_vars\",\n        version='TBD')\n    def __init__(self, **kwds):\n        super(RelaxIntegrality, self).__init__(**kwds)\n", "path": "pyomo/core/plugins/transform/relax_integrality.py"}]}