From: dblack@...
Date: 2006-03-25T03:22:31+09:00
Subject: Re: Bug: Syntax error when using 'or' keyword

Hi --

On Sat, 25 Mar 2006, Daniel Harple wrote:

> I am getting a parse error when using the 'or' keyword. I do not get this 
> error with '||'.
>
> $ ruby -v
> ruby 1.8.4 (2005-12-24) [powerpc-darwin8.3.0]
>
> $ ruby-yarv -v
> ruby 2.0.0 (Base: Ruby 1.9.0 2006-02-14) [powerpc-darwin8.5.0]
> YARVCore 0.4.0 Rev: 482 (2006-03-08) [opts: ]
>
> def example(arg)
> end
>
> example(nil || 3) # -> no error
> example(nil or 3) # -> parse error, unexpected kOR, expecting ')'

There was a thread about this recently on ruby-core.  Matz summed up
the situation as follows:

   OK.  Keyword logical operators (and, or, not) are far lower precedence
   than comma, even lower than method calls without argument parentheses
   (in parser, they are called as commands), so that they are not allowed
   be a part of argument expression.


David

-- 
David A. Black (dblack@wobblini.net)
Ruby Power and Light, LLC (http://www.rubypowerandlight.com)

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