using.rb

def using (v, &block)
    begin
        block.call
    ensure
        v.close unless v.nil? if v.class.method_defined? :close
    end
end

class Resource
   def name () 
       return "The emperor"
   end
   def close() 
       puts "close called";
   end
end

using (v = Resource.new) {
    puts "block calling with v.name = " + v.name
    raise "error"
    puts "block called"
}

v.name()