inspect.getsourcelines() is buggy on 3.12 #104866

% cat gsl.py
import inspect

def test_list_add(self):
    def capybara() -> None:
        assert_is_value(
            [x] + [y],
            z,
        )
        assert_is_value(
            # in the binop implementation
            a,
        )

print(inspect.getsourcelines(test_list_add))
% python3.11 gsl.py 
(['def test_list_add(self):\n', '    def capybara() -> None:\n', '        assert_is_value(\n', '            [x] + [y],\n', '            z,\n', '        )\n', '        assert_is_value(\n', '            # in the binop implementation\n', '            a,\n', '        )\n'], 3)
% ~/py/cpython/python.exe gsl.py 
(['def test_list_add(self):\n', '    def capybara() -> None:\n', '        assert_is_value(\n', '            [x] + [y],\n', '            z,\n', '        )\n', '        assert_is_value(\n', '            # in the binop implementation\n'], 3)
% ~/py/cpython/python.exe -V
Python 3.12.0b1+