Изменен порядок обхода для срезов

SyntaxVisitors/SugarVisitors/SliceDesugarVisitor.cs

@@ -59,24 +59,29 @@ namespace SyntaxVisitors.SugarVisitors
                 el.Add(sl.step);
             return el;
         }
+        /*
         public override void Exit(syntax_tree_node st)
         {
             if (st is slice_expr_question)
             {
                 ProceedSliceQuestionExpr(st as slice_expr_question);
-            } else if (st is slice_expr)
-            {
-                ProceedSliceExpr(st as slice_expr); 
             }
-           // base.Exit(st);
-        }
+            else if (st is slice_expr)
+            {
+                ProceedSliceExpr(st as slice_expr);
+            } else
+            {
+                base.Exit(st);
+            }
+        }*/
+        
         public override void visit(assign _assign)
         {
-            Exit(_assign.from);
-            Exit(_assign.to);
+            _assign.from.visit(this);
+            _assign.to.visit(this);
         }
         
-        public void ProceedSliceExpr(slice_expr sl)
+        public override void visit(slice_expr sl)
         {
             var el = construct_expression_list_for_slice_expr(sl);
             if (sl.Parent is assign parent_assign && parent_assign.to == sl)
@@ -104,7 +109,7 @@ namespace SyntaxVisitors.SugarVisitors
             }
         }
 
-        public void ProceedSliceQuestionExpr(slice_expr_question sl)
+        public override void visit(slice_expr_question sl)
         {
             if (sl.Parent is assign parent_assign && parent_assign.to == sl)
             {

bin/Lib/PABCSystem.pas

@@ -10444,7 +10444,7 @@ begin
       raise new ArgumentException(GetTranslation(PARAMETER_FROM_OUT_OF_RANGE));
   
   if (situation = 0) or (situation = 1) then
-    if (&to < 0) or (&to > Len) then
+    if (&to < -1) or (&to > Len) then
       raise new ArgumentException(GetTranslation(PARAMETER_TO_OUT_OF_RANGE));
   
   if situation > 0 then