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diff --git a/sources/scalac/ast/TreeCopyFactory.java b/sources/scalac/ast/TreeCopyFactory.java
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+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**                                                                      **
+** $Id$
+\*                                                                      */
+
+package scalac.ast;
+
+import scalac.util.Name;
+import Tree.*;
+
+/**
+ * Interface for a kind of factory which, for each node constructor,
+ * takes an original node from which some data will be copied or shared.
+ *
+ * @author Michel Schinz
+ * @version 1.1
+ */
+public interface TreeCopyFactory {
+
+    public void attribute(Tree newTree, Tree oldTree);
+
+    public Tree Bad(Tree tree);
+
+    public Tree ClassDef(Tree tree,
+                         int mods,
+                         Name name,
+                         TypeDef[] tparams,
+                         ValDef[][] vparams,
+			 Tree tpe,
+                         Template impl);
+
+    public Tree PackageDef(Tree tree,
+                           Tree packaged,
+                           Template impl);
+
+    public Tree ModuleDef(Tree tree,
+                          int mods,
+                          Name name,
+                          Tree tpe,
+                          Template impl);
+
+    public Tree ValDef(Tree tree,
+                       int mods,
+                       Name name,
+                       Tree tpe,
+                       Tree rhs);
+
+    public Tree PatDef(Tree tree,
+                       int mods,
+                       Tree pat,
+                       Tree rhs);
+
+    public Tree DefDef(Tree tree,
+                       int mods,
+                       Name name,
+                       TypeDef[] tparams,
+                       ValDef[][] vparams,
+                       Tree tpe,
+                       Tree rhs);
+
+    public Tree TypeDef(Tree tree,
+                        int mods,
+                        Name name,
+			TypeDef[] tparams,
+                        Tree rhs);
+
+    public Tree Import(Tree tree,
+                       Tree expr,
+		       Name[] selectors);
+
+    public Tree CaseDef(Tree tree,
+                        Tree pat,
+                        Tree guard,
+                        Tree body);
+
+    public Template Template(Tree tree,
+                             Tree[] baseClasses,
+                             Tree[] body);
+
+    public Tree LabelDef(Tree tree,
+			 Tree[] params,
+			 Tree rhs);
+
+    public Tree Block(Tree tree,
+                      Tree[] stats);
+
+    public Tree Tuple(Tree tree,
+                      Tree[] trees);
+
+    public Tree Visitor(Tree tree,
+                        CaseDef[] cases);
+
+    public Tree Function(Tree tree,
+                         ValDef[] vparams,
+                         Tree body);
+
+    public Tree Assign(Tree tree,
+                       Tree lhs,
+                       Tree rhs);
+
+    public Tree If(Tree tree,
+                   Tree cond,
+                   Tree thenp,
+                   Tree elsep);
+
+    public Tree New(Tree tree,
+                    Template templ);
+
+    public Tree Typed(Tree tree,
+                      Tree expr,
+                      Tree tpe);
+
+    public Tree TypeApply(Tree tree,
+                          Tree fun,
+                          Tree[] args);
+
+    public Tree Apply(Tree tree,
+                      Tree fun,
+                      Tree[] args);
+
+    public Tree Super(Tree tree,
+                      Tree tpe);
+
+    public Tree This(Tree tree,
+		     Tree qualifier);
+
+    public Tree Select(Tree tree,
+                       Tree qualifier,
+                       Name selector);
+
+    public Tree Ident(Tree tree,
+                      Name name);
+
+    public Tree Literal(Tree tree,
+                        Object value);
+
+    public Tree SingletonType(Tree tree,
+			      Tree ref);
+
+    public Tree SelectFromType(Tree tree,
+			       Tree qualifier,
+			       Name selector);
+
+    public Tree FunType(Tree tree,
+                        Tree[] argtpes,
+                        Tree restpe);
+
+    public Tree CompoundType(Tree tree,
+                             Tree[] baseTypes,
+                             Tree[] refinements);
+
+    public Tree TupleType(Tree tree,
+                          Tree[] types);
+
+    public Tree AppliedType(Tree tree,
+                            Tree tpe,
+                            Tree[] args);
+
+    public Tree CovariantType(Tree tree,
+			      Tree tpe);
+
+}