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diff --git a/src/minijava/visitor/GJVisitor.java b/src/minijava/visitor/GJVisitor.java
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+++ b/src/minijava/visitor/GJVisitor.java
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+//
+// Generated by JTB 1.3.2
+//
+
+package minijava.visitor;
+import minijava.syntaxtree.AllocationExpression;
+import minijava.syntaxtree.AndExpression;
+import minijava.syntaxtree.ArrayAllocationExpression;
+import minijava.syntaxtree.ArrayAssignmentStatement;
+import minijava.syntaxtree.ArrayLength;
+import minijava.syntaxtree.ArrayLookup;
+import minijava.syntaxtree.ArrayType;
+import minijava.syntaxtree.AssignmentStatement;
+import minijava.syntaxtree.Block;
+import minijava.syntaxtree.BooleanType;
+import minijava.syntaxtree.BracketExpression;
+import minijava.syntaxtree.ClassDeclaration;
+import minijava.syntaxtree.ClassExtendsDeclaration;
+import minijava.syntaxtree.CompareExpression;
+import minijava.syntaxtree.Expression;
+import minijava.syntaxtree.ExpressionList;
+import minijava.syntaxtree.ExpressionRest;
+import minijava.syntaxtree.FalseLiteral;
+import minijava.syntaxtree.FormalParameter;
+import minijava.syntaxtree.FormalParameterList;
+import minijava.syntaxtree.FormalParameterRest;
+import minijava.syntaxtree.Goal;
+import minijava.syntaxtree.Identifier;
+import minijava.syntaxtree.IfStatement;
+import minijava.syntaxtree.IntegerLiteral;
+import minijava.syntaxtree.IntegerType;
+import minijava.syntaxtree.MainClass;
+import minijava.syntaxtree.MessageSend;
+import minijava.syntaxtree.MethodDeclaration;
+import minijava.syntaxtree.MinusExpression;
+import minijava.syntaxtree.NodeList;
+import minijava.syntaxtree.NodeListOptional;
+import minijava.syntaxtree.NodeOptional;
+import minijava.syntaxtree.NodeSequence;
+import minijava.syntaxtree.NodeToken;
+import minijava.syntaxtree.NotExpression;
+import minijava.syntaxtree.PlusExpression;
+import minijava.syntaxtree.PrimaryExpression;
+import minijava.syntaxtree.PrintStatement;
+import minijava.syntaxtree.Statement;
+import minijava.syntaxtree.ThisExpression;
+import minijava.syntaxtree.TimesExpression;
+import minijava.syntaxtree.TrueLiteral;
+import minijava.syntaxtree.Type;
+import minijava.syntaxtree.TypeDeclaration;
+import minijava.syntaxtree.VarDeclaration;
+import minijava.syntaxtree.WhileStatement;
+
+/**
+ * All GJ visitors must implement this interface.
+ */
+
+public interface GJVisitor<R,A> {
+
+   //
+   // GJ Auto class visitors
+   //
+
+   public R visit(NodeList n, A argu);
+   public R visit(NodeListOptional n, A argu);
+   public R visit(NodeOptional n, A argu);
+   public R visit(NodeSequence n, A argu);
+   public R visit(NodeToken n, A argu);
+
+   //
+   // User-generated visitor methods below
+   //
+
+   /**
+    * f0 -> MainClass()
+    * f1 -> ( TypeDeclaration() )*
+    * f2 -> <EOF>
+    */
+   public R visit(Goal n, A argu);
+
+   /**
+    * f0 -> "class"
+    * f1 -> Identifier()
+    * f2 -> "{"
+    * f3 -> "public"
+    * f4 -> "static"
+    * f5 -> "void"
+    * f6 -> "main"
+    * f7 -> "("
+    * f8 -> "String"
+    * f9 -> "["
+    * f10 -> "]"
+    * f11 -> Identifier()
+    * f12 -> ")"
+    * f13 -> "{"
+    * f14 -> PrintStatement()
+    * f15 -> "}"
+    * f16 -> "}"
+    */
+   public R visit(MainClass n, A argu);
+
+   /**
+    * f0 -> ClassDeclaration()
+    *       | ClassExtendsDeclaration()
+    */
+   public R visit(TypeDeclaration n, A argu);
+
+   /**
+    * f0 -> "class"
+    * f1 -> Identifier()
+    * f2 -> "{"
+    * f3 -> ( VarDeclaration() )*
+    * f4 -> ( MethodDeclaration() )*
+    * f5 -> "}"
+    */
+   public R visit(ClassDeclaration n, A argu);
+
+   /**
+    * f0 -> "class"
+    * f1 -> Identifier()
+    * f2 -> "extends"
+    * f3 -> Identifier()
+    * f4 -> "{"
+    * f5 -> ( VarDeclaration() )*
+    * f6 -> ( MethodDeclaration() )*
+    * f7 -> "}"
+    */
+   public R visit(ClassExtendsDeclaration n, A argu);
+
+   /**
+    * f0 -> Type()
+    * f1 -> Identifier()
+    * f2 -> ";"
+    */
+   public R visit(VarDeclaration n, A argu);
+
+   /**
+    * f0 -> "public"
+    * f1 -> Type()
+    * f2 -> Identifier()
+    * f3 -> "("
+    * f4 -> ( FormalParameterList() )?
+    * f5 -> ")"
+    * f6 -> "{"
+    * f7 -> ( VarDeclaration() )*
+    * f8 -> ( Statement() )*
+    * f9 -> "return"
+    * f10 -> Expression()
+    * f11 -> ";"
+    * f12 -> "}"
+    */
+   public R visit(MethodDeclaration n, A argu);
+
+   /**
+    * f0 -> FormalParameter()
+    * f1 -> ( FormalParameterRest() )*
+    */
+   public R visit(FormalParameterList n, A argu);
+
+   /**
+    * f0 -> Type()
+    * f1 -> Identifier()
+    */
+   public R visit(FormalParameter n, A argu);
+
+   /**
+    * f0 -> ","
+    * f1 -> FormalParameter()
+    */
+   public R visit(FormalParameterRest n, A argu);
+
+   /**
+    * f0 -> ArrayType()
+    *       | BooleanType()
+    *       | IntegerType()
+    *       | Identifier()
+    */
+   public R visit(Type n, A argu);
+
+   /**
+    * f0 -> "int"
+    * f1 -> "["
+    * f2 -> "]"
+    */
+   public R visit(ArrayType n, A argu);
+
+   /**
+    * f0 -> "boolean"
+    */
+   public R visit(BooleanType n, A argu);
+
+   /**
+    * f0 -> "int"
+    */
+   public R visit(IntegerType n, A argu);
+
+   /**
+    * f0 -> Block()
+    *       | AssignmentStatement()
+    *       | ArrayAssignmentStatement()
+    *       | IfStatement()
+    *       | WhileStatement()
+    *       | PrintStatement()
+    */
+   public R visit(Statement n, A argu);
+
+   /**
+    * f0 -> "{"
+    * f1 -> ( Statement() )*
+    * f2 -> "}"
+    */
+   public R visit(Block n, A argu);
+
+   /**
+    * f0 -> Identifier()
+    * f1 -> "="
+    * f2 -> Expression()
+    * f3 -> ";"
+    */
+   public R visit(AssignmentStatement n, A argu);
+
+   /**
+    * f0 -> Identifier()
+    * f1 -> "["
+    * f2 -> Expression()
+    * f3 -> "]"
+    * f4 -> "="
+    * f5 -> Expression()
+    * f6 -> ";"
+    */
+   public R visit(ArrayAssignmentStatement n, A argu);
+
+   /**
+    * f0 -> "if"
+    * f1 -> "("
+    * f2 -> Expression()
+    * f3 -> ")"
+    * f4 -> Statement()
+    * f5 -> "else"
+    * f6 -> Statement()
+    */
+   public R visit(IfStatement n, A argu);
+
+   /**
+    * f0 -> "while"
+    * f1 -> "("
+    * f2 -> Expression()
+    * f3 -> ")"
+    * f4 -> Statement()
+    */
+   public R visit(WhileStatement n, A argu);
+
+   /**
+    * f0 -> "System.out.println"
+    * f1 -> "("
+    * f2 -> Expression()
+    * f3 -> ")"
+    * f4 -> ";"
+    */
+   public R visit(PrintStatement n, A argu);
+
+   /**
+    * f0 -> AndExpression()
+    *       | CompareExpression()
+    *       | PlusExpression()
+    *       | MinusExpression()
+    *       | TimesExpression()
+    *       | ArrayLookup()
+    *       | ArrayLength()
+    *       | MessageSend()
+    *       | PrimaryExpression()
+    */
+   public R visit(Expression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "&&"
+    * f2 -> PrimaryExpression()
+    */
+   public R visit(AndExpression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "<"
+    * f2 -> PrimaryExpression()
+    */
+   public R visit(CompareExpression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "+"
+    * f2 -> PrimaryExpression()
+    */
+   public R visit(PlusExpression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "-"
+    * f2 -> PrimaryExpression()
+    */
+   public R visit(MinusExpression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "*"
+    * f2 -> PrimaryExpression()
+    */
+   public R visit(TimesExpression n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "["
+    * f2 -> PrimaryExpression()
+    * f3 -> "]"
+    */
+   public R visit(ArrayLookup n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "."
+    * f2 -> "length"
+    */
+   public R visit(ArrayLength n, A argu);
+
+   /**
+    * f0 -> PrimaryExpression()
+    * f1 -> "."
+    * f2 -> Identifier()
+    * f3 -> "("
+    * f4 -> ( ExpressionList() )?
+    * f5 -> ")"
+    */
+   public R visit(MessageSend n, A argu);
+
+   /**
+    * f0 -> Expression()
+    * f1 -> ( ExpressionRest() )*
+    */
+   public R visit(ExpressionList n, A argu);
+
+   /**
+    * f0 -> ","
+    * f1 -> Expression()
+    */
+   public R visit(ExpressionRest n, A argu);
+
+   /**
+    * f0 -> IntegerLiteral()
+    *       | TrueLiteral()
+    *       | FalseLiteral()
+    *       | Identifier()
+    *       | ThisExpression()
+    *       | ArrayAllocationExpression()
+    *       | AllocationExpression()
+    *       | NotExpression()
+    *       | BracketExpression()
+    */
+   public R visit(PrimaryExpression n, A argu);
+
+   /**
+    * f0 -> <INTEGER_LITERAL>
+    */
+   public R visit(IntegerLiteral n, A argu);
+
+   /**
+    * f0 -> "true"
+    */
+   public R visit(TrueLiteral n, A argu);
+
+   /**
+    * f0 -> "false"
+    */
+   public R visit(FalseLiteral n, A argu);
+
+   /**
+    * f0 -> <IDENTIFIER>
+    */
+   public R visit(Identifier n, A argu);
+
+   /**
+    * f0 -> "this"
+    */
+   public R visit(ThisExpression n, A argu);
+
+   /**
+    * f0 -> "new"
+    * f1 -> "int"
+    * f2 -> "["
+    * f3 -> Expression()
+    * f4 -> "]"
+    */
+   public R visit(ArrayAllocationExpression n, A argu);
+
+   /**
+    * f0 -> "new"
+    * f1 -> Identifier()
+    * f2 -> "("
+    * f3 -> ")"
+    */
+   public R visit(AllocationExpression n, A argu);
+
+   /**
+    * f0 -> "!"
+    * f1 -> Expression()
+    */
+   public R visit(NotExpression n, A argu);
+
+   /**
+    * f0 -> "("
+    * f1 -> Expression()
+    * f2 -> ")"
+    */
+   public R visit(BracketExpression n, A argu);
+
+}