I am getting some strange behaviour using luaLaTeX and a rather simple command definition. I am using TeXLive 2012, Linux x86_64. When \settowidth is used in the preamble to compute the width of some ...
While in the document body I like to temporary switch back to the mode active in the LaTeX preamble, i.e. spaces between macros should be ignored. I don't mind whether I get the ! LaTeX Error: Missing ...