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To replicate, in Python 3.1 on Linux (utf-8 console):
>>> print(chr(0x9000))
退
Copy and paste this character into the prompt. It appears correctly (as a Chinese character). Then:
>>> import readline
>>> readline.parse_and_bind('"\M-i":" "')
Now try to paste the character again: it appears as " ��"
 (four spaces, two unknown character symbols), and if you press return, you get a SyntaxError.
This happens with all characters beginning with \xe9: In UTF-8, that's 0x9000-0x9fff. If the terminal encoding is changed to cp1252, I'm told that the same thing can be achieved with é, which is \xe9 there.