[tex-hyphen] hyphenation in LuaTeX

[Élie Roux]

Hello,

I'm currently experimenting with patterns loading during runtime (in
the sense of not in the format) in LuaTeX. I managed to get some
things done by patching babel a bit, but got blocked at one point: the
file

\input loadhyph-fr.tex
\bye

doesn't compile, it gives me "Conflicting pattern ignored."

What is the signification of this error, and how can I get things working?

Thank you,
-- 
Elie