From: "Xavier R." <lists@...>
Date: 2013-02-24T03:09:45+09:00
Subject: Re: how to see the class creation time in Ruby?

Ohh! here I tried but none of them worked.

>> foo.object_id.last_modified
NoMethodError: undefined method `last_modified' for 10535580:Fixnum
  from (irb):18
  from /usr/bin/irb:12:in `<main>'
>> ObjectSpace._id2ref(foo.object_id).last_modified
NoMethodError: undefined method `last_modified' for [15, 15]:Array
  from (irb):19
  from /usr/bin/irb:12:in `<main>'
>> ObjectSpace._id2ref(foo.object_id)
=> [15, 15]
>> Array.try_convert(foo)
=> [15, 15]
>> Array.try_convert(foo).last_modified
NoMethodError: undefined method `last_modified' for [15, 15]:Array
  from (irb):22
  from /usr/bin/irb:12:in `<main>'
>>

Could you tell me the trick?

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