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About `lookup-key'

From: Xue Fuqiao
Subject: About `lookup-key'
Date: Sat, 9 Feb 2013 22:08:56 +0800

In (info "(elisp) Functions for Key Lookup"):

  If the string or vector KEY is not a valid key sequence according
  to the prefix keys specified in KEYMAP, it must be "too long" and
  have extra events at the end that do not fit into a single key

It is the documentation of the function `lookup-key'.  I have a question: why 
must it be "too long"?  Can't it be a wrong key sequence, such as `C-!' in the 

Best regards, Xue Fuqiao.

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