Writing more real program and squashing bugs

ast.cpp

@@ -498,6 +498,7 @@ ast_module_namespace(Token *pos, Ast_Module *module, Intern_String name){
 function Ast_Module *
 ast_module(Intern_String filename){
   AST_NEW(Module, MODULE, 0, 0);
+  result->parent_scope = 0;
   result->kind = AST_MODULE;
   result->name  = filename;
   result->module = result;