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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _FileFetchFailed(self, index, request_name):
 """Remove pathspec for this index and call the FileFetchFailed method."""


    pathspec, request_data = self._RemoveCompletedPathspec(index)

    # Report the request_data for this flow's caller.
    self.FileFetchFailed(pathspec, request_name, request_data=request_data)