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Reports <code>equals()</code> that takes an argument type other than <code>Any?</code>
if the class does not have another <code>equals()</code> that takes <code>Any?</code> as its argument type.
<p><b>Example:</b></p>
<pre><code>
  class Foo {
      fun equals(other: Foo?): Boolean {
          return true
      }
  }
</code></pre>
<p>To fix the problem create <code>equals()</code> method that takes an argument of type <code>Any?</code>.</p>
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