From: why the lucky stiff <ruby-core@...>
Date: 2006-05-06T00:56:49+09:00
Subject: Re: [ ruby-Bugs-4344 ] :!~ not a symbol

Yukihiro Matsumoto wrote:
> Yes, and it's because !~ (along with &&, ||, etc.) is a part of
> syntax, not a operator (method).  If you really want to create a
> symbol with a name "!~", you can do it by :"!~", but I don't think
> that's not what you want.  In my opinion, this error is useful to
> remind you that they are not usual operator symbols.
>   
Hey, matz.  What is the use of the unary !@ operator?  Can it actually 
be called?

 >> true.send("!@")
 NoMethodError: undefined method `!' for true:TrueClass
        from (irb):3:in `send'
        from (irb):3

_why