CG4: fix 1

cgroup4.sv

@@ -8,7 +8,10 @@ int A, B;
 
 covergroup cg @(posedge clk);
   pb1: coverpoint A {
-    bins bb[] = {0,1,2,3};
+    bins b0 = {0};
+    bins b1 = {1};
+    bins b2 = {2};
+    bins b3 = {3};
     };
   pb2: coverpoint B;
   pb1x2: cross A,B;