Alexey Izbyshev <izbys...@ispras.ru> added the comment:

@eryksun Very interesting! BTW, I looked at CreateFile docs, and the fact that 
it may set the last error to zero is even documented there.

@steve.dower
> maybe we don't have to preserve errno on Windows?

There are still places where errno is relied upon. PR 5784 shows one such 
place: os.[f]truncate(). Others are e.g. os.open() and os.lseek().

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