From: Love U Ruby <lists@...>
Date: 2013-07-01T04:29:02+09:00
Subject: variable names not allowed "?" and "!" but method name does - why?

We can write a method name as foo! or foo?; but not the same with
variable names. Like

foo? = 2
# ~> -:1: syntax error, unexpected '='
# ~> foo? = 2

So why such design?

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