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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Add M-x occur to the menu-bar
Date: Tue, 10 Feb 2004 07:44:50 -0500
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    +  (if (buffer-local-value 
    +       'compilation-next-error-function 
    +       compilation-last-buffer)
    +      ;; do the right thing for modes that bind compilation-next-error-function

It is cleaner to check for a non-nil value than to
check for a local binding.