Errors from `ObjectSpace._id2ref`

objectid, ruby, ruby-1.9

Solution

`not id value` means that there never was an object with that id.

`recycled object` means that there once was an object with that id, but it has been garbage collected.

Demo on Ruby 1.9.3/Ubuntu:

x = Object.new
id = x.object_id

puts "0x%x" % id
# => 0x4aef5e8

puts ObjectSpace._id2ref id
# => #<Object:0x95debd0>

x = nil

puts ObjectSpace._id2ref id
# => #<Object:0x95debd0>

GC.start

puts ObjectSpace._id2ref id
# => 0x4aef5e8 is recycled object (RangeError)

Note that the number in `Object#to_s` is not the `object_id` - according to the docs it is "an encoding of the object id".

Problem

Original source