From: -j b- <jrb562@...>
Date: 2008-11-07T03:33:23+09:00
Subject: Array.include? issue

I have the following method defined within a class.

def move
    @heading ||= '>'
    @history << [@x,@y,@heading]
    case @heading
    when '>'
        @y += 1
    when '<'
        @y -= 1
    when '^'
        @x -= 1
    else
        @x += 1
    end
    error_out("Infinite Loop") if @history.include?([@x,@y,@heading])
end

which works as expected on my linux machine. 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.
This is a single threaded application and in no other place is @history
modified.
I first ran on OS X with ruby version 1.8.2 and then installed 1.8.7
with the same results. I am running version 1.8.7 on my linux machine.
Is there an obvious thing that I am missing here?
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