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diff --git a/tiger-compiler/src/ast/ast.hh b/tiger-compiler/src/ast/ast.hh
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+++ b/tiger-compiler/src/ast/ast.hh
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+/**
+ ** \file ast/ast.hh
+ ** \brief Declaration of ast::Ast.
+ */
+
+#pragma once
+
+#include <ast/fwd.hh>
+#include <ast/location.hh>
+
+namespace ast
+{
+  /// Ast.
+  class Ast
+  {
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct an Ast node.
+    explicit Ast(const Location& location);
+    Ast(const Ast&) = delete;
+    Ast& operator=(const Ast&) = delete;
+    /// Destroy an Ast node.
+    virtual ~Ast() = default;
+    /** \} */
+
+    /// \name Visitors entry point.
+    /// \{ */
+    /// Accept a const visitor \a v.
+    virtual void accept(ConstVisitor& v) const = 0;
+    /// Accept a non-const visitor \a v.
+    virtual void accept(Visitor& v) = 0;
+    /// \}
+
+    /** \name Accessors.
+     ** \{ */
+    /// Return scanner position information.
+    const Location& location_get() const;
+    /// Set scanner position information.
+    void location_set(const Location&);
+    /** \} */
+
+  protected:
+    /// Scanner position information.
+    Location location_;
+  };
+} // namespace ast
+#include <ast/ast.hxx>