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Merge bzr.dev.

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bzrlib/commands.py
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            sys.stdout.flush()
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            return result
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        except IOError, e:
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            if not hasattr(e, 'errno'):
 
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            if getattr(e, 'errno', None) is None:
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                raise
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            if e.errno != errno.EPIPE:
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                # Win32 raises IOError with errno=0 on a broken pipe