Allow extern variables

boot/ast.cc

@@ -415,11 +415,23 @@ namespace elna::boot
     {
     }
 
+    variable_declaration::variable_declaration(const struct position position,
+            std::vector<identifier_definition>&& identifier, std::shared_ptr<type_expression> variable_type,
+            std::monostate)
+        : node(position), m_variable_type(variable_type), identifiers(std::move(identifier)), is_extern(true)
+    {
+    }
+
     void variable_declaration::accept(parser_visitor *visitor)
     {
         visitor->visit(this);
     }
 
+    bool variable_declaration::has_initializer() const
+    {
+        return this->is_extern || this->body != nullptr;
+    }
+
     type_expression& variable_declaration::variable_type()
     {
         return *m_variable_type;