src/share/classes/com/sun/tools/javac/code/Types.java

*** 1296,1305 ****
--- 1296,1326 ----
          }
          return ts.isEmpty() && ss.isEmpty();
      }
      // </editor-fold>
  
+     /**
+      * Can t and s be compared for equality?
+      *
+      */
+     public boolean isEqualityComparable(Type t, Type s, Warner warn) {
+         if (t.tag == ERROR)
+             return true;
+         boolean tPrimitive = t.isPrimitive();
+         boolean sPrimitive = s.isPrimitive();
+         if (tPrimitive && sPrimitive) {
+             return isSubtypeUnchecked(t, s, warn);
+         } else if (!tPrimitive && !sPrimitive)
+             return isCastable(t, s, warn);
+         else if (allowBoxing) {
+             return tPrimitive
+                 ? isSubtype(unboxedType(s), t)
+                 : isSubtype(unboxedType(t), s);
+         } else
+             return false;
+     }
+ 
      // <editor-fold defaultstate="collapsed" desc="isCastable">
      public boolean isCastable(Type t, Type s) {
          return isCastable(t, s, noWarnings);
      }