From: Daniel Berger <Daniel.Berger@...>
Date: 2006-03-30T04:38:38+09:00
Subject: Re: Where is Fixnum#power! coming from?

Daniel Harple wrote:
> On Mar 29, 2006, at 9:22 PM, Daniel Berger wrote:
> 
>> I realize there's a Fixnum#power! method defined in rational.rb, but 
>> it appears that Fixnum has that method available to it whether or not 
>> I require rational.rb.  I looked through the Ruby source and didn't 
>> see anything.
>>
>> djberge@~-710>irb
>> irb(main):001:0> Fixnum.instance_methods(false).grep(/power/)
>> => ["rpower", "power!"]
>>
>> So, where the heck is it coming from?
> 
> $ irb -rubygems
>  > 2.power!(3)
> => 8
>  > exit
> $ irb
>  > 2.power!(3)
> NoMethodError: undefined method `power!' for 2:Fixnum
>         from (irb):1
>         from :0
> 
> Are you requiring rubygems?
> 
> -- Daniel

Aha!  I'm not explicitly require'ing it, but my $RUBYOPT was set.  Once I unset 
it, I got the expected error.

Thanks,

Dan