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From: sunway <sunwayforever@gmail.com>
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Subject: Is there any elisp functions to tell whether the cursor is in a 
	comment block?
Date: Sat, 12 Jul 2008 22:06:04 -0700 (PDT)
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for example, if the cursor is in a normal c code block, I want 'if '
to be expanded to 'if () {}', if it is in the comment block, I prefer
'if ' not be expanded.