diff --git a/Parsers/PascalABCParserNewSaushkin/ABCPascal.cs b/Parsers/PascalABCParserNewSaushkin/ABCPascal.cs
index 567aa29dc..6a8dae13c 100644
--- a/Parsers/PascalABCParserNewSaushkin/ABCPascal.cs
+++ b/Parsers/PascalABCParserNewSaushkin/ABCPascal.cs
@@ -2,7 +2,7 @@
 //  This CSharp output file generated by Gardens Point LEX
 //  Version:  1.1.3.301
 //  Machine:  DESKTOP-P4NLNB1
-//  DateTime: 5/4/2020 10:24:40 AM
+//  DateTime: 5/5/2020 6:55:25 PM
 //  UserName: fatco
 //  GPLEX input file <ABCPascal.lex>
 //  GPLEX frame file <embedded resource>
diff --git a/Parsers/PascalABCParserNewSaushkin/ABCPascalYacc.cs b/Parsers/PascalABCParserNewSaushkin/ABCPascalYacc.cs
index 1b8b39812..2643bae14 100644
--- a/Parsers/PascalABCParserNewSaushkin/ABCPascalYacc.cs
+++ b/Parsers/PascalABCParserNewSaushkin/ABCPascalYacc.cs
@@ -2,7 +2,7 @@
 
 // GPPG version 1.3.6
 // Machine:  DESKTOP-P4NLNB1
-// DateTime: 5/4/2020 10:24:41 AM
+// DateTime: 5/5/2020 6:55:26 PM
 // UserName: fatco
 // Input file <ABCPascal.y>
 
diff --git a/SyntaxVisitors/SugarVisitors/SliceDesugarVisitor.cs b/SyntaxVisitors/SugarVisitors/SliceDesugarVisitor.cs
index 923ed50c1..d492b08ea 100644
--- a/SyntaxVisitors/SugarVisitors/SliceDesugarVisitor.cs
+++ b/SyntaxVisitors/SugarVisitors/SliceDesugarVisitor.cs
@@ -59,6 +59,8 @@ namespace SyntaxVisitors.SugarVisitors
                 el.Add(sl.step);
             return el;
         }
+
+        /*
         public override void Exit(syntax_tree_node st)
         {
             if (st is slice_expr_question)
@@ -68,15 +70,15 @@ namespace SyntaxVisitors.SugarVisitors
             {
                 ProceedSliceExpr(st as slice_expr); 
             }
-           // base.Exit(st);
-        }
+        }*/
+
         public override void visit(assign _assign)
         {
-            ProcessNode(_assign.from);
-            ProcessNode(_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 +106,7 @@ 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)
             {
diff --git a/bin/Lib/PABCSystem.pas b/bin/Lib/PABCSystem.pas
index c93f682d9..49a2bebba 100644
--- a/bin/Lib/PABCSystem.pas
+++ b/bin/Lib/PABCSystem.pas
@@ -10387,7 +10387,7 @@ 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