From: Paul Bergstrom <pal@...>
Date: 2010-10-16T04:07:36+09:00
Subject: Setting variable with either value

Is there a better way to write this?

@a = "abc"

@a = @b if @b

This will set value @a to @b if @b already have a value since before. If
not it will use the default @a which is "abc".

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