syntax error, unexpected '<', expecting ';' or '\n' : <p>Tried to include a module in another one, but something goes wrong</p>

<pre><code>ruby pipboy.rb
pipboy.rb:3: syntax error, unexpected '&lt;', expecting ';' or '\n'
def Pipboy &lt; Person
            ^
pipboy.rb:22: syntax error, unexpected keyword_end, expecting end-of-input
</code></pre>
