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read_fwf on an empty file throws this (Windows-specific I think) error message: Error: Cannot read file xxx: The volume for a file has been externally altered so that the opened file is no longer valid.
Note that this is a new behaviour: before I installed the latest readr version, the error was simply Cannot read file xxx.
I have the latest readr from github (re-installed minutes ago) and I work with R version 3.2.3 on Windows 7.
# create an empty file in working dir
# this line fails
This is similar to this issue, which has been solved by returning empty structures when the file was empty. I suggest to extend the fix to read_fwf.
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