console_log

MBA:~ tagomoris$ ruby objspace_test.rb 
objspace_test.rb:14:in `block in <main>': can't convert Yay to Integer (Yay#to_int gives Yay) (TypeError)
	from objspace_test.rb:12:in `each_object'
	from objspace_test.rb:12:in `<main>'
MBA:~ tagomoris$ ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]

objspace_test.rb

require 'objspace'

class Yay < BasicObject
  def method_missing(name, *args, &block)
    self
  end
end

y = Yay.new

map = {}
ObjectSpace.each_object {|obj|
  klass = obj.class rescue Object
  if c = map[klass]
    map[klass] = c + 1
  else
    map[klass] = 1
  end
}

p map