[luatex] Memory leak in token.put_next() implementation

[luigi scarso]

On Tue, 29 Oct 2024 at 06:13, user202729--- via luatex <luatex at tug.org>
wrote:

> I notice that the `run_put_next` function inserts the token list using
>
>         begin_token_list(h,0);
>
> however, this has the problem that in `end_token_list`, the token list is
> not freed when the type is `0` (i.e. `parameter`).
>
> I think the `0` should be changed to e.g. `inserted` (4), so that it is
> correctly freed.
>
> For a test case, consider the following program.
>
> ```
> lualatex '\directlua{i=1; t=token.get_next()}~\def~#1A{\directlua{i=i+1;if
> i&1023==0 then print(i) end;for i=1,1000 do token.put_next(t); end}A}~A'
> </dev/null
> ```
>
> Before the change, the memory usage grows steadily. After the change, the
> memory usage remains constant.
>
> Please take a look. Thank you.
>
>
Ok, thank you.

--
luigi
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