+/*
+ * Type scopes also contain a separate registry for struct, variant and
+ * enum types. Those register types rather than type declarations, so
+ * that a named variant can be declared without specifying its target
+ * "choice" tag field immediately.
+ */
+int register_struct_type(GQuark struct_name, struct type_struct *struct_type,
+ struct type_scope *scope);
+struct type_struct *lookup_struct_type(GQuark struct_name,
+ struct type_scope *scope);
+int register_variant_type(GQuark variant_name,
+ struct type_variant *variant_type,
+ struct type_scope *scope);
+struct type_variant *lookup_variant_type(GQuark variant_name,
+ struct type_scope *scope);
+int register_enum_type(GQuark enum_name, struct type_enum *enum_type,
+ struct type_scope *scope);
+struct type_enum *lookup_enum_type(GQuark enum_name,
+ struct type_scope *scope);
+
+struct type_scope *new_type_scope(struct type_scope *parent_scope);
+void free_type_scope(struct type_scope *scope);
+
+/*
+ * field_declaration is for field declarations. They are registered into
+ * declaration scopes.
+ */
+struct declaration *
+ lookup_field_declaration(GQuark field_name,
+ struct declaration_scope *scope);
+int register_field_declaration(GQuark field_name,
+ struct declaration *declaration,
+ struct declaration_scope *scope);
+struct declaration_scope *
+ new_declaration_scope(struct declaration_scope *parent_scope);
+void free_declaration_scope(struct declaration_scope *scope);
+
+void type_ref(struct type *type);
+void type_unref(struct type *type);
+
+void declaration_ref(struct declaration *declaration);
+void declaration_unref(struct declaration *declaration);