prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Add test for `A᧚ = 0`
  Black v19.10b0 fails to parse certain assignments involving unicode identifiers - [playground link here](https://black.now.sh/?version=stable&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4ABLADtdAD2IimZxl1N_WjMy7A7oUimP5kl9tNitfjGTgMhZej2xgomiikPHniF7YMrqeF7JYab2JGKtxYQLJtMAAACEQNE3-XEpLQABV0wDcxaqH7bzfQEAAAAABFla).
  
  ```python
  A᧚
  A፩
  ```
  
  This code is in fact valid Python, as you can confirm by pasting it into a repl or with `compile("A\u19da = 0")`.
  
  Found, as with most of my bugs, via [Hypothesmith](https://github.com/Zac-HD/hypothesmith).  Given that this applies to multiple unicode digit characters, it might be due to unicode digits in identifiers?
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `fuzz.py`
  Content:
  ```
  1 """Property-based tests for Black.
  2 
  3 By Zac Hatfield-Dodds, based on my Hypothesmith tool for source code
  4 generation.  You can run this file with `python`, `pytest`, or (soon)
  5 a coverage-guided fuzzer I'm working on.
  6 """
  7 
  8 import re
  9 
  10 import hypothesmith
  11 from hypothesis import HealthCheck, given, settings, strategies as st
  12 
  13 import black
  14 from blib2to3.pgen2.tokenize import TokenError
  15 
  16 
  17 # This test uses the Hypothesis and Hypothesmith libraries to generate random
  18 # syntatically-valid Python source code and run Black in odd modes.
  19 @settings(
  20     max_examples=1000,  # roughly 1k tests/minute, or half that under coverage
  21     derandomize=True,  # deterministic mode to avoid CI flakiness
  22     deadline=None,  # ignore Hypothesis' health checks; we already know that
  23     suppress_health_check=HealthCheck.all(),  # this is slow and filter-heavy.
  24 )
  25 @given(
  26     # Note that while Hypothesmith might generate code unlike that written by
  27     # humans, it's a general test that should pass for any *valid* source code.
  28     # (so e.g. running it against code scraped of the internet might also help)
  29     src_contents=hypothesmith.from_grammar() | hypothesmith.from_node(),
  30     # Using randomly-varied modes helps us to exercise less common code paths.
  31     mode=st.builds(
  32         black.FileMode,
  33         line_length=st.just(88) | st.integers(0, 200),
  34         string_normalization=st.booleans(),
  35         preview=st.booleans(),
  36         is_pyi=st.booleans(),
  37         magic_trailing_comma=st.booleans(),
  38     ),
  39 )
  40 def test_idempotent_any_syntatically_valid_python(
  41     src_contents: str, mode: black.FileMode
  42 ) -> None:
  43     # Before starting, let's confirm that the input string is valid Python:
  44     compile(src_contents, "<string>", "exec")  # else the bug is in hypothesmith
  45 
  46     # Then format the code...
  47     try:
  48         dst_contents = black.format_str(src_contents, mode=mode)
  49     except black.InvalidInput:
  50         # This is a bug - if it's valid Python code, as above, Black should be
  51         # able to cope with it.  See issues #970, #1012, #1358, and #1557.
  52         # TODO: remove this try-except block when issues are resolved.
  53         return
  54     except TokenError as e:
  55         if (  # Special-case logic for backslashes followed by newlines or end-of-input
  56             e.args[0] == "EOF in multi-line statement"
  57             and re.search(r"\\($|\r?\n)", src_contents) is not None
  58         ):
  59             # This is a bug - if it's valid Python code, as above, Black should be
  60             # able to cope with it.  See issue #1012.
  61             # TODO: remove this block when the issue is resolved.
  62             return
  63         raise
  64 
  65     # And check that we got equivalent and stable output.
  66     black.assert_equivalent(src_contents, dst_contents)
  67     black.assert_stable(src_contents, dst_contents, mode=mode)
  68 
  69     # Future test: check that pure-python and mypyc versions of black
  70     # give identical output for identical input?
  71 
  72 
  73 if __name__ == "__main__":
  74     # Run tests, including shrinking and reporting any known failures.
  75     test_idempotent_any_syntatically_valid_python()
  76 
  77     # If Atheris is available, run coverage-guided fuzzing.
  78     # (if you want only bounded fuzzing, just use `pytest fuzz.py`)
  79     try:
  80         import sys
  81         import atheris
  82     except ImportError:
  83         pass
  84     else:
  85         test = test_idempotent_any_syntatically_valid_python
  86         atheris.Setup(sys.argv, test.hypothesis.fuzz_one_input)
  87         atheris.Fuzz()
  88
  ```
  --- 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/fuzz.py b/fuzz.py
  --- a/fuzz.py
  +++ b/fuzz.py
  @@ -48,7 +48,7 @@
           dst_contents = black.format_str(src_contents, mode=mode)
       except black.InvalidInput:
           # This is a bug - if it's valid Python code, as above, Black should be
  -        # able to cope with it.  See issues #970, #1012, #1358, and #1557.
  +        # able to cope with it.  See issues #970, #1012
           # TODO: remove this try-except block when issues are resolved.
           return
       except TokenError as e:
  
verification_info: {"golden_diff": "diff --git a/fuzz.py b/fuzz.py\n--- a/fuzz.py\n+++ b/fuzz.py\n@@ -48,7 +48,7 @@\n         dst_contents = black.format_str(src_contents, mode=mode)\n     except black.InvalidInput:\n         # This is a bug - if it's valid Python code, as above, Black should be\n-        # able to cope with it.  See issues #970, #1012, #1358, and #1557.\n+        # able to cope with it.  See issues #970, #1012\n         # TODO: remove this try-except block when issues are resolved.\n         return\n     except TokenError as e:\n", "issue": "Add test for `A\u19da = 0`\nBlack v19.10b0 fails to parse certain assignments involving unicode identifiers - [playground link here](https://black.now.sh/?version=stable&state=_Td6WFoAAATm1rRGAgAhARYAAAB0L-Wj4ABLADtdAD2IimZxl1N_WjMy7A7oUimP5kl9tNitfjGTgMhZej2xgomiikPHniF7YMrqeF7JYab2JGKtxYQLJtMAAACEQNE3-XEpLQABV0wDcxaqH7bzfQEAAAAABFla).\r\n\r\n```python\r\nA\u19da\r\nA\u1369\r\n```\r\n\r\nThis code is in fact valid Python, as you can confirm by pasting it into a repl or with `compile(\"A\\u19da = 0\")`.\r\n\r\nFound, as with most of my bugs, via [Hypothesmith](https://github.com/Zac-HD/hypothesmith).  Given that this applies to multiple unicode digit characters, it might be due to unicode digits in identifiers?\n", "before_files": [{"content": "\"\"\"Property-based tests for Black.\n\nBy Zac Hatfield-Dodds, based on my Hypothesmith tool for source code\ngeneration.  You can run this file with `python`, `pytest`, or (soon)\na coverage-guided fuzzer I'm working on.\n\"\"\"\n\nimport re\n\nimport hypothesmith\nfrom hypothesis import HealthCheck, given, settings, strategies as st\n\nimport black\nfrom blib2to3.pgen2.tokenize import TokenError\n\n\n# This test uses the Hypothesis and Hypothesmith libraries to generate random\n# syntatically-valid Python source code and run Black in odd modes.\n@settings(\n    max_examples=1000,  # roughly 1k tests/minute, or half that under coverage\n    derandomize=True,  # deterministic mode to avoid CI flakiness\n    deadline=None,  # ignore Hypothesis' health checks; we already know that\n    suppress_health_check=HealthCheck.all(),  # this is slow and filter-heavy.\n)\n@given(\n    # Note that while Hypothesmith might generate code unlike that written by\n    # humans, it's a general test that should pass for any *valid* source code.\n    # (so e.g. running it against code scraped of the internet might also help)\n    src_contents=hypothesmith.from_grammar() | hypothesmith.from_node(),\n    # Using randomly-varied modes helps us to exercise less common code paths.\n    mode=st.builds(\n        black.FileMode,\n        line_length=st.just(88) | st.integers(0, 200),\n        string_normalization=st.booleans(),\n        preview=st.booleans(),\n        is_pyi=st.booleans(),\n        magic_trailing_comma=st.booleans(),\n    ),\n)\ndef test_idempotent_any_syntatically_valid_python(\n    src_contents: str, mode: black.FileMode\n) -> None:\n    # Before starting, let's confirm that the input string is valid Python:\n    compile(src_contents, \"<string>\", \"exec\")  # else the bug is in hypothesmith\n\n    # Then format the code...\n    try:\n        dst_contents = black.format_str(src_contents, mode=mode)\n    except black.InvalidInput:\n        # This is a bug - if it's valid Python code, as above, Black should be\n        # able to cope with it.  See issues #970, #1012, #1358, and #1557.\n        # TODO: remove this try-except block when issues are resolved.\n        return\n    except TokenError as e:\n        if (  # Special-case logic for backslashes followed by newlines or end-of-input\n            e.args[0] == \"EOF in multi-line statement\"\n            and re.search(r\"\\\\($|\\r?\\n)\", src_contents) is not None\n        ):\n            # This is a bug - if it's valid Python code, as above, Black should be\n            # able to cope with it.  See issue #1012.\n            # TODO: remove this block when the issue is resolved.\n            return\n        raise\n\n    # And check that we got equivalent and stable output.\n    black.assert_equivalent(src_contents, dst_contents)\n    black.assert_stable(src_contents, dst_contents, mode=mode)\n\n    # Future test: check that pure-python and mypyc versions of black\n    # give identical output for identical input?\n\n\nif __name__ == \"__main__\":\n    # Run tests, including shrinking and reporting any known failures.\n    test_idempotent_any_syntatically_valid_python()\n\n    # If Atheris is available, run coverage-guided fuzzing.\n    # (if you want only bounded fuzzing, just use `pytest fuzz.py`)\n    try:\n        import sys\n        import atheris\n    except ImportError:\n        pass\n    else:\n        test = test_idempotent_any_syntatically_valid_python\n        atheris.Setup(sys.argv, test.hypothesis.fuzz_one_input)\n        atheris.Fuzz()\n", "path": "fuzz.py"}], "after_files": [{"content": "\"\"\"Property-based tests for Black.\n\nBy Zac Hatfield-Dodds, based on my Hypothesmith tool for source code\ngeneration.  You can run this file with `python`, `pytest`, or (soon)\na coverage-guided fuzzer I'm working on.\n\"\"\"\n\nimport re\n\nimport hypothesmith\nfrom hypothesis import HealthCheck, given, settings, strategies as st\n\nimport black\nfrom blib2to3.pgen2.tokenize import TokenError\n\n\n# This test uses the Hypothesis and Hypothesmith libraries to generate random\n# syntatically-valid Python source code and run Black in odd modes.\n@settings(\n    max_examples=1000,  # roughly 1k tests/minute, or half that under coverage\n    derandomize=True,  # deterministic mode to avoid CI flakiness\n    deadline=None,  # ignore Hypothesis' health checks; we already know that\n    suppress_health_check=HealthCheck.all(),  # this is slow and filter-heavy.\n)\n@given(\n    # Note that while Hypothesmith might generate code unlike that written by\n    # humans, it's a general test that should pass for any *valid* source code.\n    # (so e.g. running it against code scraped of the internet might also help)\n    src_contents=hypothesmith.from_grammar() | hypothesmith.from_node(),\n    # Using randomly-varied modes helps us to exercise less common code paths.\n    mode=st.builds(\n        black.FileMode,\n        line_length=st.just(88) | st.integers(0, 200),\n        string_normalization=st.booleans(),\n        preview=st.booleans(),\n        is_pyi=st.booleans(),\n        magic_trailing_comma=st.booleans(),\n    ),\n)\ndef test_idempotent_any_syntatically_valid_python(\n    src_contents: str, mode: black.FileMode\n) -> None:\n    # Before starting, let's confirm that the input string is valid Python:\n    compile(src_contents, \"<string>\", \"exec\")  # else the bug is in hypothesmith\n\n    # Then format the code...\n    try:\n        dst_contents = black.format_str(src_contents, mode=mode)\n    except black.InvalidInput:\n        # This is a bug - if it's valid Python code, as above, Black should be\n        # able to cope with it.  See issues #970, #1012\n        # TODO: remove this try-except block when issues are resolved.\n        return\n    except TokenError as e:\n        if (  # Special-case logic for backslashes followed by newlines or end-of-input\n            e.args[0] == \"EOF in multi-line statement\"\n            and re.search(r\"\\\\($|\\r?\\n)\", src_contents) is not None\n        ):\n            # This is a bug - if it's valid Python code, as above, Black should be\n            # able to cope with it.  See issue #1012.\n            # TODO: remove this block when the issue is resolved.\n            return\n        raise\n\n    # And check that we got equivalent and stable output.\n    black.assert_equivalent(src_contents, dst_contents)\n    black.assert_stable(src_contents, dst_contents, mode=mode)\n\n    # Future test: check that pure-python and mypyc versions of black\n    # give identical output for identical input?\n\n\nif __name__ == \"__main__\":\n    # Run tests, including shrinking and reporting any known failures.\n    test_idempotent_any_syntatically_valid_python()\n\n    # If Atheris is available, run coverage-guided fuzzing.\n    # (if you want only bounded fuzzing, just use `pytest fuzz.py`)\n    try:\n        import sys\n        import atheris\n    except ImportError:\n        pass\n    else:\n        test = test_idempotent_any_syntatically_valid_python\n        atheris.Setup(sys.argv, test.hypothesis.fuzz_one_input)\n        atheris.Fuzz()\n", "path": "fuzz.py"}]}