<p>Right, I noticed but forgot to mention setting mb->error becoming redundant, thanks.</p>
<p>As for the error message, if you grep around a bit you'll notice that the common pattern for these things is:</p>
<p>::</p>
<p>...where  is a file name or similar, and in this case it'd be the macro, and  is the strerror(errno) / %m. It might actually be the unexpanded macro that makes it easier to trace the origin, but not sure about that.</p>

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