Since April 2018, LaTeX2e has used \lastnamedcs in \@ifundefined for LuaTeX. See commit https://github.com/latex3/latex2e/commit/82b49f596543e183885c90d207b3765a7094b356. Since \@ifundefined is used by many command-defining commands, the fact that \lastnamedcs is not implemented might bring inconvenience to LuaTeX + unravel users.
Currently I seldom come to the situation that I must run LuaTeX with unravel, but not sure if this holds for other unravel users.
muzimuzhi
commented
3 years ago
Since April 2018, LaTeX2e has used
\lastnamedcsin\@ifundefinedfor LuaTeX. See commit https://github.com/latex3/latex2e/commit/82b49f596543e183885c90d207b3765a7094b356. Since\@ifundefinedis used by many command-defining commands, the fact that\lastnamedcsis not implemented might bring inconvenience to LuaTeX +unravelusers.Currently I seldom come to the situation that I must run LuaTeX with
unravel, but not sure if this holds for otherunravelusers.