[luatex] Error: "! This can't happen (add_disc_widths)."

Paul Isambert zappathustra at free.fr
Sat May 31 19:01:55 CEST 2014

It’s a known bug. See:


(Let’s hope the bug id won’t prevent Saint Taco from exorcizing it.)


Le samedi 31 mai 2014 à 06:43, Daniel Flipo a écrit:
> Hi all,
> In French typography, when two quotations are embedded, every line of the
> inner one should start with a quote character («) followed by a kern (there
> are variants, but let's stick to this one).
> I am trying to implement this in LuaTeX using the following trick inside
> inner quotations:
> -- When a line break occurs on a disc node, it is easy to add any hlist (« +
> kern in my case) at the beginning of the next line using the "post" field of
> the disc node; this part works fine.
> -- As most line breaks occur on a glue node, I try to replace any glue node
> by a disc node with
> "pre"     = empty,
> "post"    = "« + kern",
> "replace" = the replaced glue.
> When I add the Lua code implementing this replacement (glue -> disc) to
> pre_linebreak_filter, and I get the error message:
> "! This can't happen (add_disc_widths)."
> Thanks in advance for comments and/or ideas for a workaround.
> Best wishes,
> --
> Daniel Flipo

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