Re-generated the AST bootstrap code with visitors and abstract classes.

Author: tritao

src/AST/ASTVisitor.cs

@@ -43,7 +43,7 @@ public class AstVisitorOptions
     /// this will visit all the nodes in a default way that should be useful
     /// for a lot of applications.
     /// </summary>
-    public abstract class AstVisitor : IAstVisitor<bool>, IAstVisited
+    public abstract partial class AstVisitor : IAstVisitor<bool>, IAstVisited
     {
         public ISet<object> Visited { get; private set; }
         public AstVisitorOptions VisitOptions { get; private set; }
@@ -64,6 +64,11 @@ public bool AlreadyVisited(Declaration decl)
             return !Visited.Add(decl);
         }
 
+        public bool AlreadyVisited(Stmt stmt)
+        {
+            return !Visited.Add(stmt);
+        }
+
         #region Type Visitors
 
         public virtual bool VisitType(Type type, TypeQualifiers quals)
@@ -632,5 +637,10 @@ public bool VisitNonTypeTemplateParameterDecl(NonTypeTemplateParameter nonTypeTe
         }
 
         #endregion
+
+        public virtual bool VisitStmt(Stmt stmt)
+        {
+            return !AlreadyVisited(stmt);
+        }
     }
 }