[Dev-luatex] commands with a non-letter in token.set_macro

10 Dec 2019

      Commands that should be use in token.set_macro must already exist. 
But while it is easy to predefine a command like \blub it seems not 
to be possible to do it with commands consisting of a \ with a 
non-letter. 

E.g. I put this in a luatest.lua

token.set_macro("foo","\\bar\\blub\\!")

and then compile

\def\!{hallo}
\def\blub{hallo}
\directlua{require"luatest"}
\show\foo
\bye

I get:
...
\foo=macro:
->\bar \blub BAD!.
l.254 \show\foo
so the \blub works, but not the \!.

How can one repair this?

-- 
Ulrike Fischer 
https://www.troubleshooting-tex.de/