CS.WRONGUSE.REFEQ

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  namespace NameSpace {
      struct S {
      }
      class A {
      }
  
      class Processor {
          public bool CompareArgs(S s, A a, Object o) {
              if (System.Object.ReferenceEquals(s, a)) // defect
                 return false;
             if (System.Object.ReferenceEquals(o, s)) // defect
                 return false;
             if (System.Object.ReferenceEquals(a, o)) // OK
                 return false;
             return true;
         }
     }
 }