def enter_ObjectField(self, node, key, parent, path, ancestors):
        field_name = node.name.value
        if self.known_names in field_name:
            self.context.report_error(GraphQLError(
                self.duplicate_input_field_message(field_name),
                [self.known_names[field_name], node.name]
            ))
        else:
            self.known_names[field_name] = node.name
        return False
dataset/ETHPy150Open graphql-python/graphql-core/graphql/core/validation/rules/unique_input_field_names.py/UniqueInputFieldNames.enter_ObjectField/swapped operands of `in`