From: Lloyd Linklater <lloyd@2live4.com>
Date: 2008-11-27T12:06:42+09:00
Subject: Re: How to use a passing argument(returned argument)?

>    a = 22
>    b = 33
>    swap(ref{:a}, ref{:b})
>    p a                       # => 33
>    p b                       # => 22


instead of swap(ref{:a}, ref{:b})

why not a, b = b, a
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