def __iter__(self):
        reasonsWhyNot = set()
        for result in self.idea._doObtain(self.retriever, None, reasonsWhyNot):
            yield result
        self.reasonsWhyNot = reasonsWhyNot
For the index of a character at a certain line, calculate the index of
dataset/ETHPy150Open twisted/imaginary/imaginary/idea.py/ObtainResult.__iter__--crossover with--dataset/ETHPy150Open jonathanslenders/python-prompt-toolkit/prompt_toolkit/document.py/Document._find_line_start_index