Ruby imperfectness?

extend_module_with_context.rb

module ModuleWithMethod
  def the_method
  end
end

class ModuleWithContext < ::Module
  def initialize(context)
    @context = context
  end

  def the_method_with_context
    @context
  end
end

class Foo
  extend ModuleWithMethod
  extend ModuleWithContext.new(:the_context)

  p method(:the_method)
  p method(:the_method_with_context)
end

# A: Somewhere deep into ruby is a def extend(mod); return unless mod.class == ::Module; make_methods_available_from(mod); end
# B: I understood something fundamental in the wrong way.

jruby-1.6.8.txt

#<Method: Class(ModuleWithMethod)#the_method>
NameError: undefined method `the_method_with_context' for class `#<Class:0x2dc0435>'
  method at org/jruby/RubyKernel.java:2054
     Foo at extend_module_with_context.rb:21
  (root) at extend_module_with_context.rb:16

rbx-head.txt

#<Method: Class#the_method (defined in ModuleWithMethod at /home/mbj/devel/3928397/extend_module_with_context.rb:2)>
An exception occurred running extend_module_with_context.rb
    undefined method `the_method_with_context' for Foo (NameError)

Backtrace:
              Kernel(Class)#method at kernel/common/kernel18.rb:163
          Foo.__class_init__ (Foo) at extend_module_with_context.rb:21
                 Object#__script__ at extend_module_with_context.rb:16
  Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:68
  Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:110
           Rubinius::Loader#script at kernel/loader.rb:614
             Rubinius::Loader#main at kernel/loader.rb:815

ruby-1.8.7-p371.txt

#<Method: Class(ModuleWithMethod)#the_method>
extend_module_with_context.rb:21:in `method': undefined method `the_method_with_context' for class `Class' (NameError)
	from extend_module_with_context.rb:21

ruby-1.9.3-p286.txt

#<Method: Class(ModuleWithMethod)#the_method>
extend_module_with_context.rb:21:in `method': undefined method `the_method_with_context' for class `Class' (NameError)
	from extend_module_with_context.rb:21:in `<class:Foo>'
	from extend_module_with_context.rb:16:in `<main>'