title: Rubymine and Ruby namespaces, Expected: ; or end of line
body: <pre><code>RubyMine 2016.3.1
  Build #RM-163.9166.34, built on December 15, 2016
  ...
  JRE: 1.8.0_112-release-408-b6 amd64
  JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
  </code></pre>
  
  <p>If I create this class:</p>
  
  <pre><code>class Account::User
  end
  </code></pre>
  
  <p>Rubymine lint an error <code>Expected: ; or end of line</code> at first colon.</p>
  
  <p>It's a rubymine bug?</p>