which expect that the
  <code>Object.equals(Object)</code> method is overridden.
</p>
<p><b>Example:</b></p>
<pre><code>
  class Foo {
      public boolean equals(Foo foo) {  // warning
          return false;
      }
  }
  class Bar {
      public boolean equals(Bar bar) {  // no warning here
          return false;
      }
      @Override
      public boolean equals(Object obj) {
          return false;
      }
  }
</code></pre>
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