On 7/8/2021 4:21 PM, Michal Vlasák wrote:
Hello,
in the generic font loader code `nuts.setfield` is `nil`.
This is because in `luatex-basics-nod.lua` there is a wrong assignment
for `nuts.setfield` on line 121 (there is no `setfield` at that scope,
it should be `direct.setfield`). This is the required patch:
```diff
--- a/luatex-basics-nod.lua
+++ b/luatex-basics-nod.lua
@@ -118,7 +118,7 @@ nuts.setcomponents = direct.setcomponents
nuts.setdirection = direct.setdirection
nuts.setdisc = direct.setdisc
nuts.setreplace = direct.setreplace
-nuts.setfield = setfield
+nuts.setfield = direct.setfield
ok, will do
nuts.setkern = direct.setkern
nuts.setlink = direct.setlink
nuts.setlist = direct.setlist
```
This surfaced because `nuts.setreplace` in the generic code is defined
in terms of `nuts.setfield`. Previously `nuts.setreplace` wasn't used
anywhere (I think), but since 20th May 2021 it is used when injecting
kerns into discretionaries (font-otj.lua):
See also https://www.mail-archive.com/ntg-context@ntg.nl/msg98463.html.
Minimal not working example is:
```
\font\f=file:{./BaskervilleF-BoldItalic.otf}:mode=node;script=latn;kern=yes;
at10pt
\f B\-C
\bye
```
Fails with:
"warning (node filter): error: ./luatex-fonts-merged.lua:5166: attempt to call a
nil value (upvalue 'setfield')".
Interestingly I can't reproduce the issue with Latin Modern, although it
seems to have a similar kern:
```
\font\f=file:lmroman10-regular.otf:mode=node;script=latn;kern=yes; at10pt
\f V\-a
\bye
one is injected before and one after so one ends up in the replacement
part which involves setfield
Hans
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