Monkey patch ERB::Util#html_escape in rails

gistfile1.rb

class ERB
  module Util
    def html_escape(*args)
      puts "FFFFFF"
    end

    alias h html_escape

    singleton_class.send(:remove_method, :html_escape)
    module_function :html_escape, :h
  end
end

puts "LOADING"

puts ERB::Util.html_escape("call html_escape")
puts ERB::Util.h("call h")