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From: Richard Stallman <rms@gnu.org>
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Subject: Re: arguments hint
Date: Tue, 01 Jun 2004 23:45:09 -0400
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    Is there a mode for Emacs that gives hints on function
    arguments?  For instance, I type

      int result = function(

    and immediatly after '(' is typed, Emacs shows in a
    small window:

      int
      function(int x, int y, int z)

Whether a feature like this already exists in Emacs, I don't know.
But it sounds useful.