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	script.append(b'%s %d 0\n' % (salt, line))			script.append(b'%s %d 0\n' % (salt, line))
	else:			else:
	script.append(b'echo %s %d $?\n' % (salt, line))			script.append(b'echo %s %d $?\n' % (salt, line))
	active = []			active = []
	session = str(uuid.uuid4())			session = str(uuid.uuid4())
	if PYTHON3:			if PYTHON3:
	session = session.encode('ascii')			session = session.encode('ascii')
	def toggletrace(cmd):			def toggletrace(cmd):
	quoted = shellquote(cmd.strip()).replace(b'\\', b'\\\\')			if isinstance(cmd, str):
				quoted = shellquote(cmd.strip())
				else:
				quoted = shellquote(cmd.strip().decode('utf8')).encode('utf8')
				quoted = quoted.replace(b'\\', b'\\\\')
	if active:			if active:
	script.append(			script.append(
	b'echo END %s %s >> "$HGCATAPULTSERVERPIPE"\n' % (			b'echo END %s %s >> "$HGCATAPULTSERVERPIPE"\n' % (
	session, active[0]))			session, active[0]))
	script.append(			script.append(
	b'echo START %s %s >> "$HGCATAPULTSERVERPIPE"\n' % (			b'echo START %s %s >> "$HGCATAPULTSERVERPIPE"\n' % (
	session, quoted))			session, quoted))
	active[0:] = [quoted]			active[0:] = [quoted]

tests: avoid shellquoting bytes on Python 3ClosedPublic