[Rails] Re: Why does Kernel define class_eval?

obj = Object.new
obj.class_eval {}

--output:--
1.rb:2:in `<main>': undefined method `class_eval' for
#<Object:0x000001010913f0> (NoMethodError)


puts Kernel.instance_methods(false).include? :class_eval

--output:--
false


$ ruby --version
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin10.8.0]

$ rvm use 1.8.7

$ ruby --version
ruby 1.8.7 (2012-06-29 patchlevel 370) [i686-darwin10.8.0]

obj = Object.new
obj.class_eval {}

--output:--
1.rb:2:in `<main>': undefined method `class_eval' for
#<Object:0x000001010913f0> (NoMethodError)


puts Kernel.instance_methods(false).include? :class_eval

--output:--
false

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