MutaFix run: toolz-009

toolz/tests/test_curried.py::test_curried_operator
toolz/tests/test_curried.py::test_curried_namespace
toolz/tests/test_functoolz.py::test_memoize_key_signature
toolz/tests/test_functoolz.py::test_memoize_curry_cache
toolz/tests/test_inspect_args.py::test_has_keywords
toolz/tests/test_inspect_args.py::test_is_arity
toolz/tests/test_inspect_args.py::test_introspect_curry_py3
toolz/tests/test_signatures.py::test_for_coverage

E   AssertionError: _abs
E   assert None == False
E    +  where None = should_curry(<built-in function abs>)
E    +    where <built-in function abs> = getattr(<module 'operator' from '~\\AppData\\Roaming\\uv\\python\\cpython-3.12-windows-x86_64-none\\Lib\\operator.py'>, '_abs')
E    +  and   False = isinstance(<built-in function abs>, <class 'toolz.functoolz.curry'>)
E    +    where <class 'toolz.functoolz.curry'> = toolz.curry

E   AttributeError: 'NoneType' object has no attribute 'parameters'

1. toolz/functoolz.py::has_keywords call depth - · Ochiai 0.73 (failing 8, passing 7)
2. toolz/functoolz.py::num_required_args call depth - · Ochiai 0.60 (failing 7, passing 10)
3. toolz/functoolz.py::is_arity call depth - · Ochiai 0.51 (failing 5, passing 7)
4. toolz/functoolz.py::_check_sigspec call depth 3 · Ochiai 0.42 (failing 8, passing 37)
5. toolz/_signatures.py::check_arity call depth - · Ochiai 0.35 (failing 1, passing 0)
6. toolz/_signatures.py::_is_arity call depth - · Ochiai 0.35 (failing 1, passing 0)
7. toolz/_signatures.py::check_keywords call depth - · Ochiai 0.35 (failing 1, passing 0)
8. toolz/_signatures.py::_has_keywords call depth - · Ochiai 0.35 (failing 1, passing 0)
9. toolz/functoolz.py::has_varargs call depth 3 · Ochiai 0.33 (failing 5, passing 23)
10. toolz/functoolz.py::memoize.<locals>.key call depth - · Ochiai 0.27 (failing 2, passing 5)
11. toolz/functoolz.py::curry.__repr__ call depth 1 · Ochiai 0.25 (failing 1, passing 1)
12. toolz/functoolz.py::memoize.<locals>.memof call depth - · Ochiai 0.25 (failing 2, passing 6)
13. toolz/functoolz.py::memoize call depth - · Ochiai 0.24 (failing 2, passing 7)
14. toolz/_signatures.py::check_required_args call depth - · Ochiai 0.20 (failing 1, passing 2)
15. toolz/_signatures.py::_num_required_args call depth - · Ochiai 0.20 (failing 1, passing 2)
16. toolz/functoolz.py::curry.__init__ call depth 1 · Ochiai 0.19 (failing 3, passing 27)
17. toolz/functoolz.py::InstanceProperty.__get__ call depth - · Ochiai 0.19 (failing 3, passing 28)
18. toolz/functoolz.py::curry.__signature__ call depth 1 · Ochiai 0.14 (failing 1, passing 5)
19. toolz/functoolz.py::curry.args call depth 2 · Ochiai 0.14 (failing 2, passing 24)
20. toolz/functoolz.py::curry.keywords call depth 2 · Ochiai 0.14 (failing 2, passing 24)

We need to understand the problem: In test_curried_operator, we iterate over cop (which is toolz.curried.operator) items. For each callable v in cop, we check if it's an instance of toolz.curry. If not, we do some checks to see if it's unary etc. Then we assert: should_curry(getattr(operator, k)) == isinstance(v, toolz.curry). So should_curry returns something that should match whether v is a curry.

In the failure, for k='_abs', we got should_curry(...) returned None, and isinstance(v, toolz.curry) is False (since operator._abs is a built-in function, not a curry). So the assertion expects None == False, which fails.

Thus should_curry is returning None when it should return False (or maybe True?) for operator._abs. Let's look at should_curry definition. It's not in the candidate list but likely in toolz/curried.py. However we don't have that file in candidates. But we can infer: should_curry probably uses has_keywords, num_required_args, etc. to decide if a function should be curried.

The test also fails in test_curried_namespace with AttributeError: 'NoneType' object has no attribute 'parameters'. That suggests that somewhere we are calling .parameters on a None object, likely because sigspec is None and we try to access .parameters.

Looking at has_keywords: after _check_sigspec, if sigspec is not None, we return rv (which is the result from builtin_func). Otherwise we try to iterate over sigspec.parameters.values(). But if sigspec is None, we would have returned rv earl

We are given that the tests are still failing. The error in test_curried_operator shows:
   assert None == False
   where None = should_curry(<built-in function abs>)

This indicates that should_curry(abs) returned None, but it was expected to return False (because abs is not a curry instance).

Looking at the test_curried_operator code:

    for k, v in vars(cop).items():
        if not callable(v):
            continue

        if not isinstance(v, toolz.curry):
            try:
                # Make sure it is unary
                v(1)
            except TypeError:
                try:
                    v('x')
                except TypeError:
                    pass
                else:
                    continue
                raise AssertionError(
                    'toolz.curried.operator.%s is not curried!' % k,
                )
        assert should_curry(getattr(operator, k)) == isinstance(v, toolz.curry), k

So for each function in the operator module that is callable, if it's not already a toolz.curry instance, then we check if it's unary (by trying to call it with one argument). If it's not unary, we skip. Otherwise, we assert that should_curry(func) equals whether v is a toolz.curry.

In the case of operator._abs, it is a built-in function that takes one argument (so it's unary) and is not a toolz.curry instance. Therefore, we expect should_curry(operator._abs) to return False.

But the test shows that should_curry(operator._abs) returned None.

Now,