Running tests with Python 3.14 and hypothesmith/libcst ends with: AttributeError: 'int' object has no attribute '_codegen'

[befeleme]

When trying to build mccabe with Python 3.14, the test generating code using hypothesmith and libcst fails.
I don't see anything specific to mccabe in the test itself (https://github.com/PyCQA/mccabe/blob/master/test_mccabe.py#L244), the fail comes from max_example.

Here's the traceback.

=================================== FAILURES ===================================
________________ test_idempotent_any_syntatically_valid_python _________________

    @settings(
>       max_examples=1000,  # roughly 1k tests/minute, or half that under coverage
        derandomize=False,  # deterministic mode to avoid CI flakiness
        deadline=None,  # ignore Hypothesis' health checks; we already know that
        suppress_health_check=HealthCheck.all(),  # this is slow and filter-heavy.
    )

test_mccabe.py:245: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
/usr/lib/python3.14/site-packages/hypothesmith/cst.py:278: in <lambda>
    code = st.from_type(node).map(lambda n: libcst.Module([n]).code).filter(compilable)
/usr/lib64/python3.14/site-packages/libcst/_nodes/module.py:116: in code
    return self.code_for_node(self)
/usr/lib64/python3.14/site-packages/libcst/_nodes/module.py:136: in code_for_node
    node._codegen(state)
/usr/lib64/python3.14/site-packages/libcst/_nodes/base.py:299: in _codegen
    self._codegen_impl(state, **kwargs)
/usr/lib64/python3.14/site-packages/libcst/_nodes/module.py:99: in _codegen_impl
    stmt._codegen(state)
/usr/lib64/python3.14/site-packages/libcst/_nodes/base.py:299: in _codegen
    self._codegen_impl(state, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = Module(
    body=[
        0,
    ],
    header=[],
    footer=[],
    encoding='utf-8',
    default_indent='    ',
    default_newline='\n',
    has_trailing_newline=True,
)
state = CodegenState(default_indent='    ', default_newline='\n', provider=None, indent_tokens=[], tokens=[])

    def _codegen_impl(self, state: CodegenState) -> None:
        for h in self.header:
            h._codegen(state)
        for stmt in self.body:
>           stmt._codegen(state)
E           AttributeError: 'int' object has no attribute '_codegen'
E           while generating 'src_contents' from one_of(<hypothesmith.syntactic.GrammarStrategy object at 0x7f85519c0d70>, builds_filtering(Module).map(lambda n: libcst.Module([n]).code).filter(compilable).map(record_targets))
E           Explanation:
E               These lines were always and only run by failing examples:
E                   /usr/lib/python3.14/site-packages/hypothesmith/cst.py:122
E           Highest target scores:
E                          1  (label='(hypothesmith from_node) number of unique ast node types')
E                          1  (label='(hypothesmith from_node) total number of ast nodes')
E                          1  (label='(hypothesmith) number of unique ast node types')
E                          1  (label='(hypothesmith) total number of ast nodes')
E                          3  (label='(hypothesmith from_node) instructions in bytecode')
E                          3  (label='(hypothesmith) instructions in bytecode')

/usr/lib64/python3.14/site-packages/libcst/_nodes/module.py:99: AttributeError

[zsol]

Can you repro this with 3.13? The test output says there's a module with body=[0] which is not a valid cst

[befeleme]

The test passes alright with Python 3.13 (in both cases it's hypothesmith 0.3.3, LibCST 1.6.0)