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diff --git a/tiger-compiler/src/ast/fwd.hh b/tiger-compiler/src/ast/fwd.hh
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+++ b/tiger-compiler/src/ast/fwd.hh
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+/**
+ ** \file ast/fwd.hh
+ ** \brief Forward declarations of all AST classes
+ ** (needed by the visitors).
+ */
+
+#pragma once
+
+#include <list>
+#include <vector>
+#include <misc/fwd.hh>
+#include <misc/vector.hh>
+
+namespace ast
+{
+  class ArrayExp;
+  class ArrayTy;
+  class AssertExp;
+  class AssignExp;
+  class Ast;
+  class BreakExp;
+  class CallExp;
+  class CastExp;
+  class ChunkList;
+  class ClassTy;
+  class Dec;
+  class Escapable;
+  class Exp;
+  class Field;
+  class FieldInit;
+  class FieldVar;
+  class ForExp;
+  class FunctionDec;
+  class IfExp;
+  class IntExp;
+  class LetExp;
+  class MethodCallExp;
+  class MethodDec;
+  class NameTy;
+  class NilExp;
+  class ObjectExp;
+  class OpExp;
+  class RecordExp;
+  class RecordTy;
+  class SeqExp;
+  class SimpleVar;
+  class StringExp;
+  class SubscriptVar;
+  class Ty;
+  class Typable;
+  class TypeConstructor;
+  class TypeDec;
+  class Var;
+  class VarDec;
+  class WhileExp;
+
+  // From visitor.hh
+  template <template <typename> class Const> class GenVisitor;
+  using ConstVisitor = GenVisitor<misc::constify_traits>;
+  using Visitor = GenVisitor<misc::id_traits>;
+
+  // Collections of nodes.
+  using exps_type = std::vector<Exp*>;
+  using fieldinits_type = std::vector<FieldInit*>;
+  using fields_type = std::vector<Field*>;
+
+  // From chunk-interface.hh.
+  class ChunkInterface;
+
+  // From chunk-list.hh.
+  class ChunkList;
+
+  // From chunk.hh.
+  template <typename T> class Chunk;
+  using FunctionChunk = Chunk<FunctionDec>;
+  using MethodChunk = Chunk<MethodDec>;
+  using TypeChunk = Chunk<TypeDec>;
+  using VarChunk = Chunk<VarDec>;
+
+} // namespace ast