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diff --git a/tiger-compiler/src/desugar/desugar-visitor.hh b/tiger-compiler/src/desugar/desugar-visitor.hh
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+/**
+ ** \file desugar/desugar-visitor.hh
+ ** \brief Declaration of desugar::DesugarVisitor.
+ */
+
+#pragma once
+
+#include <map>
+
+#include <astclone/cloner.hh>
+
+namespace desugar
+{
+  /// \brief Desugar some syntactic structures while duplicating an Ast.
+  class DesugarVisitor : public astclone::Cloner
+  {
+  public:
+    /// Superclass.
+    using super_type = astclone::Cloner;
+
+    // Import overloaded virtual functions.
+    using super_type::operator();
+
+    /// Build a DesugarVisitor.
+    DesugarVisitor(bool desugar_for_p, bool desugar_string_cmp_p);
+
+    /// \name Visit methods.
+    /// \{
+    /// Desugar string comparisons.
+    void operator()(const ast::OpExp&) override;
+    /// Desugar `for' loops as `while' loops.
+    void operator()(const ast::ForExp&) override;
+    /// \}
+
+  private:
+    /// Desugar `for' loops?
+    bool desugar_for_p_;
+    /// Desugar string comparisons?
+    bool desugar_string_cmp_p_;
+  };
+
+} // namespace desugar