diff --git a/src/main/antlr/.antlr/VSLParser.java b/src/main/antlr/.antlr/VSLParser.java
index 49b9618..eaa5a3a 100644
--- a/src/main/antlr/.antlr/VSLParser.java
+++ b/src/main/antlr/.antlr/VSLParser.java
@@ -108,7 +108,7 @@ public class VSLParser extends Parser {
 
 	@SuppressWarnings("CheckReturnValue")
 	public static class ProgramContext extends ParserRuleContext {
-		public Program p;
+		public ProgramImp p;
 		public FunctionContext func;
 		public TerminalNode EOF() { return getToken(VSLParser.EOF, 0); }
 		public FunctionContext function() {
@@ -130,7 +130,7 @@ public class VSLParser extends Parser {
 			((ProgramContext)_localctx).func = function();
 			setState(21);
 			match(EOF);
-			((ProgramContext)_localctx).p =  new Program(((ProgramContext)_localctx).func.out);
+			((ProgramContext)_localctx).p =  new ProgramImp(((ProgramContext)_localctx).func.out);
 			}
 		}
 		catch (RecognitionException re) {
@@ -146,7 +146,7 @@ public class VSLParser extends Parser {
 
 	@SuppressWarnings("CheckReturnValue")
 	public static class FunctionContext extends ParserRuleContext {
-		public List<Function> out;
+		public ArrayList<Function> out;
 		public TypeContext t;
 		public IdentContext i;
 		public List_instrContext instrs;
diff --git a/src/main/antlr/VSLParser.g b/src/main/antlr/VSLParser.g
index d9f6331..ccf87aa 100644
--- a/src/main/antlr/VSLParser.g
+++ b/src/main/antlr/VSLParser.g
@@ -21,14 +21,14 @@ options {
     }
 }
 
-program returns [Program p] :
+program returns [ProgramImp p] :
   func=function
   EOF
-  {$p = new Program($func.out);}
+  {$p = new ProgramImp($func.out);}
 ;
 
 
-function returns [List<Function> out]
+function returns [ArrayList<Function> out]
   @init{
     SymTable sym_table = new SymTable();
   }:
diff --git a/src/main/java/TP2/Main.java b/src/main/java/TP2/Main.java
index ca8eee9..79b496b 100644
--- a/src/main/java/TP2/Main.java
+++ b/src/main/java/TP2/Main.java
@@ -8,7 +8,7 @@ import org.antlr.runtime.CharStream;
 import org.antlr.runtime.CommonTokenStream;
 import org.antlr.runtime.RecognitionException;
 
-import TP2.asd.*;
+import TP2.asd.Program.*;
 import java.util.*;
 
 public class Main {
@@ -32,7 +32,7 @@ public class Main {
       VSLParser parser = new VSLParser(tokens);
 
       // Parse
-      ProgramImpl ast = parser.program();
+      ProgramImp ast = parser.program();
 
       // Pretty-print the program (to debug parsing)
       System.err.println("todo " + ast);
diff --git a/src/main/java/TP2/asd/Interface.java b/src/main/java/TP2/asd/Interface.java
index 898e8d6..918665a 100644
--- a/src/main/java/TP2/asd/Interface.java
+++ b/src/main/java/TP2/asd/Interface.java
@@ -1,6 +1,7 @@
 package TP2.asd;
 
 import java.util.Map;
+import TP2.asd.Program.*;
 
 public interface Interface{
     public interface Expression {
@@ -12,17 +13,17 @@ public interface Interface{
     }
 
     public interface ProgramVisitor<H,S> {
-        public S visitProgram(Program p, H h);
-        public S visitFunction(Program.Function f, H h);
+        public S visitProgram(ProgramImp p, H h);
+        public S visitFunction(Function f, H h);
     }
 
     public interface InstrVisitor<H,S>{
-        public S visitReturn(Program.Return_instr e, H h);
+        public S visitReturn(Return_instr e, H h);
     }
 
     public interface ExprVisitor<H,S> {
-        public S visitConst(Program.Const e,H h);
-        public S visitBinOp(Program.BinopExpression e, H h);
+        public S visitConst(Const e,H h);
+        public S visitBinOp(BinopExpression e, H h);
     }
 
     public interface Type{
diff --git a/src/main/java/TP2/asd/Program.java b/src/main/java/TP2/asd/Program.java
index a70791b..46cd0fe 100644
--- a/src/main/java/TP2/asd/Program.java
+++ b/src/main/java/TP2/asd/Program.java
@@ -1,9 +1,17 @@
 package TP2.asd;
 
 import java.util.ArrayList;
+import java.util.List;
+
 import TP2.asd.Interface.*;
 
 public class Program{
+    public static record ProgramImp(ArrayList<Instruction> instructions){
+        public <H, S> S accept(ProgramVisitor<H, S> v, H h) {
+            return v.visitProgram(this, h);
+        }
+    }
+
     public static record Function(Type type, String nom, ArrayList<Instruction> instructions){
         public Function(Type type, String name, Instruction instruction) {
             this(type, name, new ArrayList<>() {{ add(instruction); }});