getsource crash in Python 3.14 REPL

[pomponchik]

Hi!

I opened the REPL and typed the following code:

>>> from dill.source import getsource as dill_getsource
>>>
>>>
>>> def f():
...     pass
...
>>> dill_getsource(f)
Traceback (most recent call last):
  File "<python-input-4>", line 1, in <module>
    dill_getsource(f)
    ~~~~~~~~~~~~~~^^^
  File "/Users/pomponchik/Desktop/Projects/symplug/venv/lib/python3.14/site-packages/dill/source.py", line 374, in getsource
    lines, lnum = getsourcelines(object, enclosing=enclosing)
                  ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/pomponchik/Desktop/Projects/symplug/venv/lib/python3.14/site-packages/dill/source.py", line 345, in getsourcelines
    code, n = getblocks(object, lstrip=lstrip, enclosing=enclosing, locate=True)
              ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/pomponchik/Desktop/Projects/symplug/venv/lib/python3.14/site-packages/dill/source.py", line 271, in getblocks
    lines, lnum = findsource(object)
                  ~~~~~~~~~~^^^^^^^^
  File "/Users/pomponchik/Desktop/Projects/symplug/venv/lib/python3.14/site-packages/dill/source.py", line 176, in findsource
    raise IOError('could not extract source code')
OSError: could not extract source code

As you can see, I got an error.

My operating system is macOS. Python version is 3.14.2 (version 3.14.2:df793163d58, December 5 2025, 12:18:06). Dill’s version is 0.4.0 (i also tried 0.4.1, the result is the same).

I also tried to do the same thing on the same computer, but using Python 3.10, and everything was fine:

Python 3.10.8 (v3.10.8:aaaf517424, Oct 11 2022, 10:14:40) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from dill.source import getsource as dill_getsource
>>>
>>> def f():
...     pass
...
>>> dill_getsource(f)
'def f():\n\tpass\n'
>>>

By the way, I also looked at the tests, and I did not find a test that would check the behavior of dill.source.getsource in the REPL.