Rails core - Jun 2014 - ObjectSpace#allocation_class_path not working as expected.

Using Ruby Version 2.1.2


class A
  def foo
    ObjectSpace::trace_object_allocations do
      obj = Object.new
      p "#{ObjectSpace::allocation_class_path(obj)}"
    end
  endend
A.new.foo #=> "Class"

The above method is expected to return back the allocation class path of 
the object.
But I am getting an empty string back instead of "Class".
Is it an implementation bug in the method or the documentation is not 
updated.


Thanks

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