fix special case

backends/common.v

+module assert_equal(input clk, input test, input pat);
+    always @(posedge clk)
+    begin
+        if (test != pat)
+        begin
+            $display("ERROR: ASSERTION FAILED in %m:",$time);
+            $stop;
+        end
+    end
+endmodule 
+
 module assert_dff(input clk, input test, input pat);
     always @(posedge clk)
     begin

backends/write_simplec/testbench.v

@@ -31,10 +31,10 @@ module testbench;
     dinA <= !dinA;
     end
 	
-	assert_dff b_test(.clk(en), .test(dinA), .pat(dioB[0]));
+	assert_equal b_test(.clk(en), .test(dinA), .pat(dioB[0]));
 	
-	assert_dff c_test(.clk(en), .test(dinA), .pat(doutC[0]));
+	assert_equal c_test(.clk(en), .test(dinA), .pat(doutC[0]));
 	
-	assert_dff cz_test(.clk(!en), .test(1'bZ), .pat(doutC[0]));
+	assert_equal cz_test(.clk(!en), .test(1'bZ), .pat(doutC[0]));
     
 endmodule