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From: Richard Stallman <rms@gnu.org>
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Subject: Re: cperl mode hangs when used with narrowing under certain conditions
Date: Thu, 21 Nov 2002 12:11:16 -0500
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Could you get the latest code from CVS on savannah.gnu.org
and see if it still fails?

    Press <TAB>
    => emacs freezes; it has to be killed

Does C-g work?

Could you debug it with GDB and see what it is doing?
It might be looping; see etc/DEBUG for advice about
how to investigate an endless loop in Emacs.