add: added projectsHEADmain

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diff --git a/tiger-compiler/src/type/pretty-printer.hh b/tiger-compiler/src/type/pretty-printer.hh
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+++ b/tiger-compiler/src/type/pretty-printer.hh
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+/**
+ ** \file type/pretty-printer.hh
+ ** \brief Print the type hierarchy.
+ */
+
+#pragma once
+
+#include <ostream>
+
+#include <type/default-visitor.hh>
+#include <type/fwd.hh>
+
+namespace type
+{
+  class PrettyPrinter : public DefaultConstVisitor
+  {
+  public:
+    /// Super class type.
+    using super_type = DefaultConstVisitor;
+
+    // Import overloaded \c operator() methods.
+    using super_type::operator();
+
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct a pretty printer.
+    explicit PrettyPrinter(std::ostream& ostr);
+    /** \} */
+
+    /** \name Visit basic types.
+     ** \{ */
+    void operator()(const Nil& e) override;
+    void operator()(const Void& e) override;
+    void operator()(const Int& e) override;
+    void operator()(const String& e) override;
+    /** \} */
+
+    /** \name Visit composed types.
+     ** \{ */
+    void operator()(const Named& e) override;
+    void operator()(const Array& e) override;
+    void operator()(const Record& e) override;
+    void operator()(const Class& e) override;
+    void operator()(const Function& e) override;
+    /** \} */
+
+    /** \name Visit Non type types.
+     ** \{ */
+    void operator()(const Attribute& e);
+    void operator()(const Field& e);
+    /** \} */
+
+  private:
+    /// The stream to print on.
+    std::ostream& ostr_;
+  };
+
+  /// Overload redirection operator for Type.
+  std::ostream& operator<<(std::ostream& ostr, const Type& t);
+
+  /// Overload redirection operator for Attribute.
+  std::ostream& operator<<(std::ostream& ostr, const Attribute& obj);
+
+  /// Overload redirection operator for Field.
+  std::ostream& operator<<(std::ostream& ostr, const Field& obj);
+
+} // namespace type