prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Add option to remove coupon code from basket
  There isn't option to remove coupon code from basket. Should likely be done with basket command at basket view [this](https://github.com/shuup/shuup/blob/master/shuup/core/basket/commands.py#L177).
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `shuup/front/basket/commands.py`
  Content:
  ```
  1 # -*- coding: utf-8 -*-
  2 # This file is part of Shuup.
  3 #
  4 # Copyright (c) 2012-2018, Shuup Inc. All rights reserved.
  5 #
  6 # This source code is licensed under the OSL-3.0 license found in the
  7 # LICENSE file in the root directory of this source tree.
  8 from shuup.core.basket.commands import (  # noqa
  9     handle_add, handle_add_campaign_code, handle_add_var, handle_clear,
  10     handle_del, handle_update
  11 )
  12
  ```
  --- 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/shuup/front/basket/commands.py b/shuup/front/basket/commands.py
  --- a/shuup/front/basket/commands.py
  +++ b/shuup/front/basket/commands.py
  @@ -7,5 +7,5 @@
   # LICENSE file in the root directory of this source tree.
   from shuup.core.basket.commands import (  # noqa
       handle_add, handle_add_campaign_code, handle_add_var, handle_clear,
  -    handle_del, handle_update
  +    handle_del, handle_remove_campaign_code, handle_update
   )
  
verification_info: {"golden_diff": "diff --git a/shuup/front/basket/commands.py b/shuup/front/basket/commands.py\n--- a/shuup/front/basket/commands.py\n+++ b/shuup/front/basket/commands.py\n@@ -7,5 +7,5 @@\n # LICENSE file in the root directory of this source tree.\n from shuup.core.basket.commands import (  # noqa\n     handle_add, handle_add_campaign_code, handle_add_var, handle_clear,\n-    handle_del, handle_update\n+    handle_del, handle_remove_campaign_code, handle_update\n )\n", "issue": "Add option to remove coupon code from basket\nThere isn't option to remove coupon code from basket. Should likely be done with basket command at basket view [this](https://github.com/shuup/shuup/blob/master/shuup/core/basket/commands.py#L177).\n", "before_files": [{"content": "# -*- coding: utf-8 -*-\n# This file is part of Shuup.\n#\n# Copyright (c) 2012-2018, Shuup Inc. All rights reserved.\n#\n# This source code is licensed under the OSL-3.0 license found in the\n# LICENSE file in the root directory of this source tree.\nfrom shuup.core.basket.commands import (  # noqa\n    handle_add, handle_add_campaign_code, handle_add_var, handle_clear,\n    handle_del, handle_update\n)\n", "path": "shuup/front/basket/commands.py"}], "after_files": [{"content": "# -*- coding: utf-8 -*-\n# This file is part of Shuup.\n#\n# Copyright (c) 2012-2018, Shuup Inc. All rights reserved.\n#\n# This source code is licensed under the OSL-3.0 license found in the\n# LICENSE file in the root directory of this source tree.\nfrom shuup.core.basket.commands import (  # noqa\n    handle_add, handle_add_campaign_code, handle_add_var, handle_clear,\n    handle_del, handle_remove_campaign_code, handle_update\n)\n", "path": "shuup/front/basket/commands.py"}]}