ast: implement cleanup callbacks

bshell.runtime/ast/int.c

@@ -8,8 +8,16 @@ static void to_string(const struct bshell_ast_node *node, fx_bstr *out)
 	fx_value_to_string(&i->n_value->tok_number, (fx_stream *)out, NULL);
 }
 
+static enum bshell_status cleanup(struct bshell_ast_node *node)
+{
+	struct bshell_int_ast_node *i = (struct bshell_int_ast_node *)node;
+	bshell_lex_token_destroy(i->n_value);
+	return BSHELL_SUCCESS;
+}
+
 struct bshell_ast_node_definition int_bshell_ast_node = {
 	.def_id = BSHELL_AST_INT,
 	.def_node_size = sizeof(struct bshell_int_ast_node),
 	.def_to_string = to_string,
+	.def_cleanup = cleanup,
 };