add: added projectsHEADmain

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diff --git a/tiger-compiler/src/parse/metavar-map.hxx b/tiger-compiler/src/parse/metavar-map.hxx
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+++ b/tiger-compiler/src/parse/metavar-map.hxx
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+/**
+ ** \file parse/metavar-map.hxx
+ ** \brief Implementation of parse::MetavarMap.
+ */
+
+#pragma once
+
+#include <sstream>
+#include <string>
+
+#include <misc/contract.hh>
+#include <misc/indent.hh>
+#include <parse/metavar-map.hh>
+
+namespace parse
+{
+  template <typename Data>
+  MetavarMap<Data>::MetavarMap(const std::string& name)
+    : name_(name)
+    , map_()
+  {}
+
+  template <typename Data> MetavarMap<Data>::~MetavarMap()
+  {
+    // At this point, every metavariable should have been taken from the map.
+    assertion(map_.empty()) << *this << "not empty, aborting.\n";
+  }
+
+  template <typename Data>
+  std::string MetavarMap<Data>::show(unsigned key) const
+  {
+    return '_' + name_ + '(' + std::to_string(key) + ')';
+  }
+
+  template <typename Data>
+  std::ostream& MetavarMap<Data>::dump(std::ostream& ostr) const
+  {
+    ostr << "MetavarMap<" << name_ << "> = [";
+
+    if (map_.empty())
+      return ostr << " ]" << misc::iendl;
+
+    ostr << misc::incindent;
+
+    for (const auto& [k, v] : map_)
+      ostr << misc::iendl << show(k) << " -> " << v;
+
+    return ostr << misc::decendl << "]" << misc::iendl;
+  }
+
+  template <typename Data>
+  std::string MetavarMap<Data>::append_(unsigned& count, Data* data)
+  {
+    map_[count] = data;
+    return show(count++);
+  }
+
+  template <typename Data> Data* MetavarMap<Data>::take_(unsigned key)
+  {
+    return map_.take(key);
+  }
+
+  template <typename Data>
+  std::ostream& operator<<(std::ostream& ostr, const MetavarMap<Data>& m)
+  {
+    return m.dump(ostr);
+  }
+
+} // namespace parse