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Possible regression in Python3.12 tokenizer #105013

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Possible regression in Python3.12 tokenizer#105013
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pablogsallysnikolaou
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interpreter-core(Objects, Python, Grammar, and Parser dirs)stdlibStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or error

Description

@arkamar
arkamar
opened on May 27, 2023

Bug report

I have encountered a possible regression while I was testing pyrsistent with python3.12_beta1, see tobgu/pyrsistent#275. Tests fail with following error:

/usr/lib/python3.12/site-packages/_pytest/python.py:617: in _importtestmodule
    mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
/usr/lib/python3.12/site-packages/_pytest/pathlib.py:564: in import_path
    importlib.import_module(module_name)
/usr/lib/python3.12/importlib/__init__.py:90: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1293: in _gcd_import
    ???
<frozen importlib._bootstrap>:1266: in _find_and_load
    ???
<frozen importlib._bootstrap>:1237: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:841: in _load_unlocked
    ???
/usr/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:178: in exec_module
    exec(co, module.__dict__)
tests/hypothesis_vector_test.py:48: in <module>
    PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
/usr/lib/python3.12/site-packages/hypothesis/strategies/_internal/strategies.py:347: in map
    if is_identity_function(pack):
/usr/lib/python3.12/site-packages/hypothesis/internal/reflection.py:638: in is_identity_function
    return bool(re.fullmatch(r"lambda (\w+): \1", get_pretty_function_description(f)))
/usr/lib/python3.12/site-packages/hypothesis/internal/reflection.py:432: in get_pretty_function_description
    return extract_lambda_source(f)
/usr/lib/python3.12/site-packages/hypothesis/internal/reflection.py:312: in extract_lambda_source
    source = inspect.getsource(f)
/usr/lib/python3.12/inspect.py:1274: in getsource
    lines, lnum = getsourcelines(object)
/usr/lib/python3.12/inspect.py:1266: in getsourcelines
    return getblock(lines[lnum:]), lnum + 1
/usr/lib/python3.12/inspect.py:1241: in getblock
    for _token in tokens:
/usr/lib/python3.12/tokenize.py:451: in _tokenize
    for token in _generate_tokens_from_c_tokenizer(source, extra_tokens=True):
/usr/lib/python3.12/tokenize.py:542: in _generate_tokens_from_c_tokenizer
    for info in c_tokenizer.TokenizerIter(source, extra_tokens=extra_tokens):
E     File "<string>", line 1
E       lambda l: (l, pvector(l)))
E                                ^
E   SyntaxError: unmatched ')'

It is triggered for this code (see https://github.com/tobgu/pyrsistent/blob/cc90f3e2b339653fde0df422aaf3ccdb3fc1225d/tests/hypothesis_vector_test.py#L48-L49 )

PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
    lambda l: (l, pvector(l)))

if I concatenate it to one line, everything works. I also tried to backport fix for #104866 as it sounds relevant, but it didn't solved the issue.

Your environment

  • Gentoo ~amd64
  • Python 3.12.0b1

Linked PRs

Activity

  1. arkamar
    added
    type-bugAn unexpected behavior, bug, or error
    on May 27, 2023
  2. arhadthedev
    added
    stdlibStandard Library Python modules in the Lib/ directory
    on May 27, 2023
  3. gentoo-bot
    added a commit that references this issue on May 27, 2023

    dev-python/hypothesis: add link to py3.12 upstream bug

    c753c4e

  4. arhadthedev commented on May 27, 2023

    @arhadthedev
    arhadthedev
    on May 27, 2023
    Member

    The typo seems to be in pyrsistent itself.

    https://github.com/tobgu/pyrsistent/blob/cc90f3e2b339653fde0df422aaf3ccdb3fc1225d/tests/hypothesis_vector_test.py#L49:

        lambda l: (l, pvector(l)))

  5. arkamar commented on May 27, 2023

    @arkamar
    arkamar
    on May 27, 2023
    ContributorAuthor

    Sorry, I don't follow, where is the typo? Why this works

    PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))

    and this doesn't

    PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
    lambda l: (l, pvector(l)))

    btw, the wrapped version works in Python3.10 and Python3.11

  6. arhadthedev commented on May 27, 2023

    @arhadthedev
    arhadthedev
    on May 27, 2023
    Member

    Correction: the third parenthesis comes from the line above (found out preparing a PR for pyrsistent):

    PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
    lambda l: (l, pvector(l)))
  7. arhadthedev
    added
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    on May 27, 2023
  8. AlexWaygood
    assigned
    pablogsal
    and
    lysnikolaou
    on May 27, 2023

  9. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    This is not failing on main for me:

    ❯ cat lel.py
PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
    lambda l: (l, pvector(l)))

❯ ./python -m tokenize < lel.py
1,0-1,15:           NAME           'PVectorAndLists'
1,16-1,17:          OP             '='
1,18-1,20:          NAME           'st'
1,20-1,21:          OP             '.'
1,21-1,26:          NAME           'lists'
1,26-1,27:          OP             '('
1,27-1,29:          NAME           'st'
1,29-1,30:          OP             '.'
1,30-1,36:          NAME           'builds'
1,36-1,37:          OP             '('
1,37-1,52:          NAME           'RefCountTracker'
1,52-1,53:          OP             ')'
1,53-1,54:          OP             ')'
1,54-1,55:          OP             '.'
1,55-1,58:          NAME           'map'
1,58-1,59:          OP             '('
1,59-1,60:          NL             '\n'
2,4-2,10:           NAME           'lambda'
2,11-2,12:          NAME           'l'
2,12-2,13:          OP             ':'
2,14-2,15:          OP             '('
2,15-2,16:          NAME           'l'
2,16-2,17:          OP             ','
2,18-2,25:          NAME           'pvector'
2,25-2,26:          OP             '('
2,26-2,27:          NAME           'l'
2,27-2,28:          OP             ')'
2,28-2,29:          OP             ')'
2,29-2,30:          OP             ')'
2,30-2,31:          NEWLINE        '\n'
3,0-3,0:            ENDMARKER      ''

  10. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    Actually, both versions work with 3.12 (current):

    v1 = """\
PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(
    lambda l: (l, pvector(l)))
"""

v2 = """\
PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))
"""

import tokenize
import pprint
import io

for code in [v1, v2]:
    b = io.StringIO(code)
    pprint.pprint(list(tokenize.generate_tokens(b.readline)))

    This shows:

    [TokenInfo(type=1 (NAME), string='PVectorAndLists', start=(1, 0), end=(1, 15), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='=', start=(1, 16), end=(1, 17), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='st', start=(1, 18), end=(1, 20), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 20), end=(1, 21), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='lists', start=(1, 21), end=(1, 26), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 26), end=(1, 27), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='st', start=(1, 27), end=(1, 29), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 29), end=(1, 30), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='builds', start=(1, 30), end=(1, 36), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 36), end=(1, 37), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='RefCountTracker', start=(1, 37), end=(1, 52), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 52), end=(1, 53), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 53), end=(1, 54), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 54), end=(1, 55), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='map', start=(1, 55), end=(1, 58), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 58), end=(1, 59), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=65 (NL), string='\n', start=(1, 59), end=(1, 60), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(\n'),
 TokenInfo(type=1 (NAME), string='lambda', start=(2, 4), end=(2, 10), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(2, 11), end=(2, 12), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=':', start=(2, 12), end=(2, 13), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(2, 14), end=(2, 15), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(2, 15), end=(2, 16), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=',', start=(2, 16), end=(2, 17), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='pvector', start=(2, 18), end=(2, 25), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(2, 25), end=(2, 26), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(2, 26), end=(2, 27), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(2, 27), end=(2, 28), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(2, 28), end=(2, 29), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(2, 29), end=(2, 30), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=4 (NEWLINE), string='\n', start=(2, 30), end=(2, 31), line='    lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=0 (ENDMARKER), string='', start=(3, 0), end=(3, 0), line='')]
[TokenInfo(type=1 (NAME), string='PVectorAndLists', start=(1, 0), end=(1, 15), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='=', start=(1, 16), end=(1, 17), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='st', start=(1, 18), end=(1, 20), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 20), end=(1, 21), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='lists', start=(1, 21), end=(1, 26), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 26), end=(1, 27), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='st', start=(1, 27), end=(1, 29), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 29), end=(1, 30), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='builds', start=(1, 30), end=(1, 36), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 36), end=(1, 37), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='RefCountTracker', start=(1, 37), end=(1, 52), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 52), end=(1, 53), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 53), end=(1, 54), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='.', start=(1, 54), end=(1, 55), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='map', start=(1, 55), end=(1, 58), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 58), end=(1, 59), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='lambda', start=(1, 59), end=(1, 65), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(1, 66), end=(1, 67), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=':', start=(1, 67), end=(1, 68), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 69), end=(1, 70), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(1, 70), end=(1, 71), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=',', start=(1, 71), end=(1, 72), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='pvector', start=(1, 73), end=(1, 80), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string='(', start=(1, 80), end=(1, 81), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=1 (NAME), string='l', start=(1, 81), end=(1, 82), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 82), end=(1, 83), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 83), end=(1, 84), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=55 (OP), string=')', start=(1, 84), end=(1, 85), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=4 (NEWLINE), string='\n', start=(1, 85), end=(1, 86), line='PVectorAndLists = st.lists(st.builds(RefCountTracker)).map(lambda l: (l, pvector(l)))\n'),
 TokenInfo(type=0 (ENDMARKER), string='', start=(2, 0), end=(2, 0), line='')]

  11. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    Can you provide a reproducer that doesn't use any 3rd party stuff that fails with main or the tip of 3.12?

  12. arkamar commented on May 27, 2023

    @arkamar
    arkamar
    on May 27, 2023
    ContributorAuthor

    pyrsistent tests still don't work with the tip of 3.12. However, I was pointed out, that similar errors occurred in hypothesis tests. I dag into it and this should be the reproducer:

    import inspect

ordered_pair = (
    lambda right: [].map(
        lambda length: ()))

print(inspect.getsource(ordered_pair))

    The issue seems to be related to reflection and it prints out following error with Python3.12

    Traceback (most recent call last):
  File "/root/test.py", line 7, in <module>
    print(inspect.getsource(ordered_pair))
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/inspect.py", line 1274, in getsource
    lines, lnum = getsourcelines(object)
                  ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/inspect.py", line 1266, in getsourcelines
    return getblock(lines[lnum:]), lnum + 1
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/inspect.py", line 1241, in getblock
    for _token in tokens:
  File "/usr/lib/python3.12/tokenize.py", line 451, in _tokenize
    for token in _generate_tokens_from_c_tokenizer(source, extra_tokens=True):
  File "/usr/lib/python3.12/tokenize.py", line 542, in _generate_tokens_from_c_tokenizer
    for info in c_tokenizer.TokenizerIter(source, extra_tokens=extra_tokens):
  File "<string>", line 2
    lambda length: ()))
                      ^
SyntaxError: unmatched ')'

    but Python3.11 prints this:

        lambda right: [].map(
        lambda length: ()))

  13. arkamar commented on May 27, 2023

    @arkamar
    arkamar
    on May 27, 2023
    ContributorAuthor

    or this one with just one lambda

    import inspect

l = (
    lambda x: ())

print(inspect.getsource(l))

  14. arkamar commented on May 27, 2023

    @arkamar
    arkamar
    on May 27, 2023
    ContributorAuthor

    It works correctly if I concatenate it to one line

    l = (lambda x: ())

  15. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    The regression here is not on the tokenize but in the inspect module. The tokenize tokenizes the source as it does in 3.11:

    $ cat lel2.py
import inspect

l = (
    lambda x: ())

print(inspect.getsource(l))

$ diff <(./python -m tokenize < lel2.py ) <(/home/pablogsal/.pyenv/shims/python3.11 -m tokenize < lel2.py)
  16. pablogsal
    added a commit that references this issue on May 27, 2023

    pythongh-105013: Fix inspect.getsource with parenthesized multiline l…

    ff9abff

  17. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    @arkamar can you check if this fixes pyrsistent with #105021 ?

  18. pablogsal
    added a commit that references this issue on May 27, 2023

    fixup! pythongh-105013: Fix inspect.getsource with parenthesized mult…

    649397d

  19. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    Seems that I can execute the test suite correctly with the fix installed:

    ❯ python -m pytest tests -v -s
=============================================================================================================================================== test session starts ===============================================================================================================================================
platform linux -- Python 3.13.0a0, pytest-7.3.1, pluggy-1.0.0 -- /home/pablogsal/github/python/main/venv/bin/python
cachedir: .pytest_cache
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('/home/pablogsal/github/python/main/pyrsistent/.hypothesis/examples')
rootdir: /home/pablogsal/github/python/main/pyrsistent
configfile: pytest.ini
plugins: hypothesis-6.75.6
collecting ...
...
============================================================================================================================ 532 passed, 102 skipped, 15 warnings in 79.66s (0:01:19) =============================================================================================================================
  20. pablogsal
    added 4 commits that reference this issue on May 27, 2023

    fixup! pythongh-105013: Fix inspect.getsource with parenthesized mult…

    9b9d810

    fixup! fixup! pythongh-105013: Fix inspect.getsource with parenthesiz…

    82f0023

    fixup! fixup! fixup! pythongh-105013: Fix inspect.getsource with pare…

    6d41c1a

    gh-105013: Fix inspect.getsource with parenthesized multiline lambdas (…

    3a5be87
  21. miss-islington
    added a commit that references this issue on May 27, 2023

    pythongh-105013: Fix inspect.getsource with parenthesized multiline l…

    da6274b

  22. pablogsal commented on May 27, 2023

    @pablogsal
    pablogsal
    on May 27, 2023
    Member

    Fixed in #105021

  23. pablogsal
    closed this as completedon May 27, 2023

  24. mgorny commented on May 28, 2023

    @mgorny
    mgorny
    on May 28, 2023
    Contributor

    I can confirm that this patch alone is sufficient to resolve the collection error in pyrsistent. Python segfaults while running the tests afterwards but FWICS this is another bug that's already fixed in the 3.12 branch.

  25. arkamar commented on May 28, 2023

    @arkamar
    arkamar
    on May 28, 2023
    ContributorAuthor

    @mgorny thanks for testing.

  26. pablogsal
    added a commit that references this issue on May 28, 2023

    [3.12] gh-105013: Fix inspect.getsource with parenthesized multiline …

    41b622b
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