From: Love U Ruby <lists@...>
Date: 2013-03-12T17:07:31+09:00
Subject: Re: Confusion with empty block printing

Humm,

Only within the `()` it is understood by IRB that i am feeding it a 
Hash, otherwise error.

>> puts {:a => 4}
SyntaxError: (irb):17: syntax error, unexpected tASSOC, expecting '}'
puts {:a => 4}
           ^
        from C:/Ruby193/bin/irb:12:in `<main>'
>> puts {:a => 4}.class
SyntaxError: (irb):18: syntax error, unexpected tASSOC, expecting '}'
puts {:a => 4}.class
           ^
        from C:/Ruby193/bin/irb:12:in `<main>'
============================
>> puts ({:a => 4}.class)
Hash
============================

Strange it is. would not it?

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