efriedma added a comment. I just ran into this warning, and I think there's a bit of a discoverability problem related to the width of tabs and -ftabstop. If you have mixed tabs and spaces, and you've correctly specified the tab stop width with -ftabstop, everything works fine. If you haven't specified -ftabstop, you get a warning, and the issue isn't obvious. Depending on your editor settings, the code might look fine at first glance, and the warning text doesn't mention -ftabstop at all. Maybe there's something that could be improved here, if we're printing a warning for two lines with mismatched indentation styles?
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