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

Ulrike Fischer news3 at nililand.de
Tue Dec 10 22:21:11 CET 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 

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


and then compile


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 

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