One more diff3 test.

Rev: src/testsuite.in:1.135

src/testsuite.in

-stest_true([["$Id: testsuite.in,v 1.134 1998/11/30 09:31:04 mast Exp $"]])
+stest_true([["$Id: testsuite.in,v 1.135 1998/12/01 15:23:29 mast Exp $"]])
 cond([[all_constants()->_verify_internals]],
 [[
   test_do(_verify_internals())
@@ -2288,6 +2288,10 @@ test_equal(Array.diff3(({"a","b"}),({"b","c"}),({"c","a"})),
 	   ({({({"a"}),({"b"}),({   }),({   })}),
 	     ({({   }),({"b"}),({"c"}),({   })}),
 	     ({({   }),({   }),({"c"}),({"a"})})}))
+test_equal(Array.diff3(({"a","b"}),({"b"}),({"c","b"})),
+	   ({({({"a"}),({"b"})}),
+	     ({({   }),({"b"})}),
+	     ({({"c"}),({"b"})})}))
 test_equal(Array.diff3(({"a","b","c","d"}),({"x","x","x","d"}),({"a","y","y","y"})),
 	   ({({({"a"}),({"b","c"    }),({"d"})}),
 	     ({({   }),({"x","x","x"}),({"d"})}),