From: Brian Candler <b.candler@...>
Date: 2008-11-07T06:10:37+09:00
Subject: Re: Array.include? issue

-j b- wrote:
> However, when I try the
> same code on OS X the
> 
>     error_out("Infinite Loop") if @history.include?([@x,@y,@heading])
> 
> fails to execute correctly. In other words, even if [@x,@y,@heading]
> exists in @history the error_out is never executed. I have verified that
> it does exist by printing the contents of the @history array before the
> check.

How did you print it? If it were me I'd add

  STDERR.puts @history.inspect
  STDERR.puts [@x, @y, @heading]

just before the error_out line. What does this show?

Could it be that error_out() really is being called, but is not behaving 
the way you expect? Try changing to

   raise "Infinite loop" if @history.include?([@x,@y,@heading])
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