I do not really understand what is the relation with macro packages and _
because it is just raw luatex.
```
\def\test{\directlua{tex.set_synctex_line(421)}}
\test
\directlua{print('421=',tex.get_synctex_line())}
\bye
```
This code expectedly prints "421=421" to the console.
If we replace line by tag, this does not work
```
\def\test{\directlua{tex.set_synctex_tag(421)}}
\test
\directlua{print('421=',tex.get_synctex_tag())}
\bye
```
This code unexpectedly prints "421=1" to the console.
On the contrary
```
\directlua{tex.set_synctex_tag(421)}
\directlua{print('421=',tex.get_synctex_tag())}
\bye
```
expectedly prints "421=421" to the console.
If this is a feature it must definitely be documented because it is really
special.
> Le 27 mars 2022 à 14:54, Hans Hagen <j.ha...@xs4all.nl> a écrit :
>
> On 3/25/2022 4:51 PM, Jérôme LAURENS wrote:
>> We can use
>> ```
>> \directlua{tex.set_synctex_tag(421)}
>> \directlua{print('421=',tex.get_synctex_tag())}
>> \bye
>> ```
>> To set and read the synctex tag.
>> But if we wrap this into a macro, things get broken and the synctex tag is
>> not changed.
>> ```
>> \def\test{\directlua{tex.set_synctex_tag(421)}}
>> \test
>> \directlua{print('421=',tex.get_synctex_tag())}
>> \bye
>> ```
>> For synctex_line there is no such problem.
>> Is this a bug or a feature ?
> feature ... but mostly macro package related as that is responsible for the
> catcode of _ which is stored in the macro body
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
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