Method abstract_get_bases

crates/vm/src/protocol/object.rs:438–449

abstract_get_bases() has logically 4 return states: 1. getattr(cls, '__bases__') could raise an AttributeError 2. getattr(cls, '__bases__') could raise some other exception 3. getattr(cls, '__bases__') could return a tuple 4. getattr(cls, '__bases__') could return something other than a tuple Only state #3 returns Some(tuple). AttributeErrors are masked by returning None. If an object other than

(&self, vm: &VirtualMachine)

    /// If an object other than a tuple comes out of __bases__, then again, None is returned.
    /// Other exceptions are propagated.
    fn abstract_get_bases(&self, vm: &VirtualMachine) -> PyResult<Option<PyTupleRef>> {
        match vm.get_attribute_opt(self.to_owned(), identifier!(vm, __bases__))? {
            Some(bases) => {
                // Check if it's a tuple
                match PyTupleRef::try_from_object(vm, bases) {
                    Ok(tuple) => Ok(Some(tuple)),
                    Err(_) => Ok(None), // Not a tuple, return None
                }
            }
            None => Ok(None), // AttributeError was masked
        }
    }

    fn abstract_issubclass(&self, cls: &Self, vm: &VirtualMachine) -> PyResult<bool> {
        // Store the current derived class to check