void assert_type (Ast_Node* node, Ast_Node_Type type) {
    if (node->type == type) return;

    char *wanted, *got, *message;
    wanted = Ast_Node_Type_to_string(type);
    got = Ast_Node_Type_to_string(node->type);
    asprintf(&message, "Type assertion failed:\n\t"
             "Wanted: %s\n\t"
             "Got   : %s\n", wanted, got);
    panic(message);
}