+std::string get_unused_variable_name(const Block &, const std::string &);
+const TypeDeclaration *get_ultimate_base_type(const TypeDeclaration *);
+bool has_layout_qualifier(const Layout *, const std::string &);
+int get_layout_value(const Layout *, const std::string &, int = -1);
+void add_layout_qualifier(RefPtr<Layout> &, const Layout::Qualifier &);
+void add_to_chain(Assignment::Target &, Assignment::Target::ChainType, unsigned);
+bool targets_overlap(const Assignment::Target &, const Assignment::Target &);
+