So maybe some of you language wizards out there can help me with this: 
Is there a way to define a method that aliases some external method 
without assigning that method to a global in the first place?

The example is the code below: For mockfs/override.rb, I'm undefining 
File, but want to keep File.join.

$join_method = File.method :join
Object.send( :remove_const, :File )
module File
	def self.join( *args )
		$join_method.call *args
	end

	def self.method_missing( symbol, *args )
		MockFS.file.send( symbol, *args )
	end
end

This works, but then I'm leaving a global variable just sitting around. 
Is there a better way to do this?

Francis Hwang
http://fhwang.net/