gistfile1.txt

>> class C
>>   def initialize(foo, bar)
>>     puts foo.inspect
>>     puts bar.inspect
>>   end
>> end
=> nil

>> C.method(:initialize).arity
=> -1
>> C.method(:new).arity
=> -1

>> C.new(:foo, :bar)
:foo
:bar
=> #<C:0x1005b6a20>

>> C.new
ArgumentError: wrong number of arguments (0 for 2)
	from (irb):25:in `initialize'
	from (irb):25:in `new'
	from (irb):25
	from :0