fix a stack overflow bug in intellisense

CodeCompletion/SymTable.cs

@@ -384,7 +384,12 @@ namespace CodeCompletion
                         tmp_ts = tmp_ts.baseScope;
                 }
                 if (ts.implemented_interfaces != null && !(ts is ArrayScope && !(ts as ArrayScope).is_dynamic_arr))
-                foreach (TypeScope int_ts in ts.implemented_interfaces)
+                {
+                    List<TypeScope> implemented_interfaces = new List<TypeScope>();
+                    implemented_interfaces.AddRange(ts.implemented_interfaces);
+                    if (ts is ArrayScope)
+                        implemented_interfaces.Add((ts as ArrayScope).ilist);
+                    foreach (TypeScope int_ts in implemented_interfaces)
                     {
                         TypeScope int_ts2 = int_ts;
                         if (int_ts is CompiledScope && (int_ts as CompiledScope).CompiledType.IsGenericType && !(int_ts as CompiledScope).CompiledType.IsGenericTypeDefinition)
@@ -410,6 +415,8 @@ namespace CodeCompletion
                         }
                     }
                 }
+                
+            }
             if (this.used_units != null)
                 for (int i = 0; i < this.used_units.Count; i++)
                 {
@@ -443,7 +450,7 @@ namespace CodeCompletion
 
         public void AddUsedUnit(SymScope unit)
         {
-            //if (!hasUsesCycle(unit))
+            if (this.si.name != "PABCSystem")
                 used_units.Add(unit);
         }
 
@@ -2912,6 +2919,7 @@ namespace CodeCompletion
         public TypeScope[] indexes;
         private bool _is_dynamic_arr = false;
         private bool _is_multi_dyn_arr = false;
+        internal TypeScope ilist;
 
         public ArrayScope()
         {
@@ -2945,6 +2953,7 @@ namespace CodeCompletion
                 lst.Add(elementType);
                 this.implemented_interfaces = new List<TypeScope>();
                 this.implemented_interfaces.Add(CompiledScope.get_type_instance(typeof(IEnumerable<>), lst));
+                ilist = CompiledScope.get_type_instance(typeof(IList<>), lst);
                 //this.implemented_interfaces.Add(CompiledScope.get_type_instance(typeof(IList<>), lst));
             }
             this.si = new SymInfo("$" + this.ToString(), SymbolKind.Type, this.ToString());