Object.send(:remove_const, :Polygon)

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<p>Newbie here.</p>
<p><br></p>
<p><br></p>
<p>F:\InstantRails-2.0-win\rails_apps&gt;irb -v</p>
<p>irb 0.9.5(05/04/13)</p>
<p><br></p>
<p>F:\InstantRails-2.0-win\rails_apps&gt;ruby -v</p>
<p>ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]</p>
<p><br></p>
<p><br></p>
<p><br></p>
<p>Consider</p>
<p><br></p>
<p><br></p>
<p>irb(main):001:0&gt; class X</p>
<p>irb(main):002:1&gt; end</p>
<p>=&gt; nil</p>
<p>irb(main):003:0&gt;</p>
<p>irb(main):004:0* class Y &lt; X</p>
<p>irb(main):005:1&gt; end</p>
<p>=&gt; nil</p>
<p>irb(main):006:0&gt;</p>
<p>irb(main):007:0* Object.send(:remove_const, :X)</p>
<p>=&gt; X</p>
<p>irb(main):008:0&gt;</p>
<p>irb(main):009:0* X.class</p>
<p>NameError: uninitialized constant X</p>
<p>&nbsp; &nbsp; &nbsp; &nbsp; from (irb):9</p>
<p>&nbsp; &nbsp; &nbsp; &nbsp; from :0</p>
<p>irb(main):010:0&gt; Y.class</p>
<p>=&gt; Class</p>
<p>irb(main):011:0&gt; Y.superclass</p>
<p>=&gt; X</p>
<p>irb(main):012:0&gt; Y.superclass.superclass</p>
<p>=&gt; Object</p>
<p>irb(main):013:0&gt;</p>
<p><br></p>
<p><br></p>
<p>How can the class X still exist when it has been removed?????</p>

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