require "erb"
require "ostruct"

vars = OpenStruct.new( :name => "David", :state => "Awesome" )

# Either update OpenStruct with get_binding()
class OpenStruct
  def get_binding
    return binding()
  end
end

binding = vars.get_binding

# Or use instance_eval
binding = vars.instance_eval("binding")

# This does not work
# binding = vars.send(:binding)

result = ERB.new("Hello <%= name %>, you're <%= state %>!").result(binding)
# "Hello David, you're awesome!"