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Re: 23.0.60; M-x occur no longer uses previous regexp as default

From: Richard M Stallman
Subject: Re: 23.0.60; M-x occur no longer uses previous regexp as default
Date: Wed, 23 Apr 2008 11:58:41 -0400 
    > Maybe one of these functions should signal an error if the regexp arg
    > is "".

    Alternatively, we could change the occur engine to display all lines for
    the "" regexp.  This is not useful, but at least can be expected for "".

I think an error would be more convenient in practice.
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