On Mon, Oct 22, 2018 at 9:58 PM Marcel Krüger wrote:

Hi,

in the implementation of \letcharcode LuaTeX calls `set_token_info(cur_cs, cur_cs + cs_token_flag);`. This is weird, because the first argument to `set_token_info` is supposed to be a pointer to a one-word node as returned by `get_avail` and not a `cs`.

I've got a document where this caused LuaTeX to overwrite a random token in a different macro every time `\letcharcode` was called. The active token isn't stored anywhere, so this can be fixed by just omitting `set_token_info`.

Best regards Marcel Krüger

Suggested patch:

diff --git a/source/texk/web2c/luatexdir/tex/maincontrol.c b/source/texk/web2c/luatexdir/tex/maincontrol.c index 05e385b27..25acf1ea9 100644 --- a/source/texk/web2c/luatexdir/tex/maincontrol.c +++ b/source/texk/web2c/luatexdir/tex/maincontrol.c @@ -2698,9 +2698,7 @@ void prefixed_command(void) /*tex |letcharcode| */ scan_int(); if (cur_val > 0) { - cur_cs = active_to_cs(cur_val, true); - set_token_info(cur_cs, cur_cs + cs_token_flag); - p = cur_cs; + p = active_to_cs(cur_val, true); do { get_token(); } while (cur_cmd == spacer_cmd);

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Thank you for the report. Do you have a sample document ? -- luigi