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How to define a snippet ?
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:Author: pluskid
:Contact: pluskid@gmail.com
:Date: 2008-03-20

Why there's an extra newline?
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If you have a newline at the end of the snippet definition file, then
YASnippet will add a newline when you expanding a snippet. Please
don't add a newline at the end if you don't want it when you saving
the snippet file.

Note some editors will automatically add a newline for you. In Emacs,
if you set ``require-final-newline`` to ``t``, it will add the final
newline for you automatically.