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diff --git a/tiger-compiler/src/ast/type-dec.hh b/tiger-compiler/src/ast/type-dec.hh
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+++ b/tiger-compiler/src/ast/type-dec.hh
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+/**
+ ** \file ast/type-dec.hh
+ ** \brief Declaration of ast::TypeDec.
+ */
+
+#pragma once
+
+#include <ast/dec.hh>
+#include <ast/ty.hh>
+#include <ast/type-constructor.hh>
+
+namespace ast
+{
+  /// TypeDec.
+  class TypeDec
+    : public Dec
+    , public TypeConstructor
+  {
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct a TypeDec node.
+    TypeDec(const Location& location, misc::symbol name, Ty* ty);
+    TypeDec(const TypeDec&) = delete;
+    TypeDec& operator=(const TypeDec&) = delete;
+    /// Destroy a TypeDec node.
+    ~TypeDec() override;
+    /** \} */
+
+    /// \name Visitors entry point.
+    /// \{ */
+    /// Accept a const visitor \a v.
+    void accept(ConstVisitor& v) const override;
+    /// Accept a non-const visitor \a v.
+    void accept(Visitor& v) override;
+    /// \}
+
+    /** \name Accessors.
+     ** \{ */
+    /// Return type definition.
+    const Ty& ty_get() const;
+    /// Return type definition.
+    Ty& ty_get();
+    /** \} */
+
+  protected:
+    /// Type definition.
+    Ty* ty_;
+  };
+} // namespace ast
+#include <ast/type-dec.hxx>