I'm going through Ruby Koans, and I"m getting hung up on the test\_every\_object\_has\_an\_id method in about\_objects.rb. The supplied code reads like so:

```
def test_every_object_has_an_id
   obj = Object.new
   assert_equal __, obj.object_id.class
end

```

I know that the answer is Fixnum, but, whenever I run path\_to\_enlightenment.rb, I get the following error message:

```
custom_require.rb:36:in `require':about_objects.rb:50: syntax error, unexpected $end, expecting keyword_end (SyntaxError) from rubygems/custom_require.rb:36:in `require'
    from path_to_enlightenment.rb:7:in `<main>'

```

Is there some sort of bug in the code as supplied, or am I doing something wrong?