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diff --git a/tiger-compiler/src/ast/array-ty.hh b/tiger-compiler/src/ast/array-ty.hh
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+/**
+ ** \file ast/array-ty.hh
+ ** \brief Declaration of ast::ArrayTy.
+ */
+
+#pragma once
+
+#include <ast/name-ty.hh>
+#include <ast/ty.hh>
+
+namespace ast
+{
+  /// ArrayTy.
+  class ArrayTy : public Ty
+  {
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct an ArrayTy node.
+    ArrayTy(const Location& location, NameTy* base_type);
+    ArrayTy(const ArrayTy&) = delete;
+    ArrayTy& operator=(const ArrayTy&) = delete;
+    /// Destroy an ArrayTy node.
+    ~ArrayTy() 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 name of the base type.
+    const NameTy& base_type_get() const;
+    /// Return name of the base type.
+    NameTy& base_type_get();
+    /** \} */
+
+  protected:
+    /// Name of the base type.
+    NameTy* base_type_;
+  };
+} // namespace ast
+#include <ast/array-ty.hxx>