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diff --git a/tiger-compiler/src/ast/nil-exp.hh b/tiger-compiler/src/ast/nil-exp.hh
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+++ b/tiger-compiler/src/ast/nil-exp.hh
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+/**
+ ** \file ast/nil-exp.hh
+ ** \brief Declaration of ast::NilExp.
+ */
+
+#pragma once
+
+#include <ast/exp.hh>
+#include <ast/type-constructor.hh>
+
+namespace ast
+{
+  /// NilExp.
+  class NilExp
+    : public Exp
+    , public TypeConstructor
+  {
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct a NilExp node.
+    explicit NilExp(const Location& location);
+    NilExp(const NilExp&) = delete;
+    NilExp& operator=(const NilExp&) = delete;
+    /// Destroy a NilExp node.
+    /** \} */
+
+    /// \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;
+    /// \}
+  };
+} // namespace ast
+#include <ast/nil-exp.hxx>