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diff --git a/tiger-compiler/src/ast/non-object-visitor.hxx b/tiger-compiler/src/ast/non-object-visitor.hxx
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+++ b/tiger-compiler/src/ast/non-object-visitor.hxx
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+/**
+ ** \file ast/non-object-visitor.hxx
+ ** \brief Implementation for ast/non-object-visitor.hh.
+ */
+
+#pragma once
+
+#include <ast/all.hh>
+#include <ast/non-object-visitor.hh>
+#include <misc/contract.hh>
+
+namespace ast
+{
+  template <template <typename> class Const>
+  GenNonObjectVisitor<Const>::GenNonObjectVisitor()
+    : GenVisitor<Const>()
+  {}
+
+  template <template <typename> class Const>
+  GenNonObjectVisitor<Const>::~GenNonObjectVisitor()
+  {}
+
+  /*-----------------------------------------.
+  | Object-related visit methods, disabled.  |
+  `-----------------------------------------*/
+
+  template <template <typename> class Const>
+  void GenNonObjectVisitor<Const>::operator()(const_t<ClassTy>&)
+  {
+    // We must not be here (there should be no object feature in plain Tiger).
+    unreachable();
+  }
+
+  template <template <typename> class Const>
+  void GenNonObjectVisitor<Const>::operator()(const_t<MethodChunk>&)
+  {
+    // We must not be here (there should be no object feature in plain Tiger).
+    unreachable();
+  }
+
+  template <template <typename> class Const>
+  void GenNonObjectVisitor<Const>::operator()(const_t<MethodDec>&)
+  {
+    // We must not be here (there should be no object feature in plain Tiger).
+    unreachable();
+  }
+
+  template <template <typename> class Const>
+  void GenNonObjectVisitor<Const>::operator()(const_t<MethodCallExp>&)
+  {
+    // We must not be here (there should be no object feature in plain Tiger).
+    unreachable();
+  }
+
+  template <template <typename> class Const>
+  void GenNonObjectVisitor<Const>::operator()(const_t<ObjectExp>&)
+  {
+    // We must not be here (there should be no object feature in plain Tiger).
+    unreachable();
+  }
+
+} // namespace ast