[XeTeX] Erroneous \lastkern

[Christian Tellechea]

Hello.


This question refers to XeLaTeX and not XeTeX which gives correct 
results (see below).


The following code shows an incorrect \lastkern value during the \ifnum 
test: the first line shows abnormal behaviour while the second, thanks 
to the \relax, gives the expected result.

%%%%%%%%%%%%%% CODE %%%%%%%%%%%%%%

\documentclass{article}

\begin{document}

Should be An: \kern2019sp A\ifnum\lastkern=2019 y\else n\fi\par

Should be An: \kern2019sp A\relax\ifnum\lastkern=2019 y\else n\fi

\end{document}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



With XeTeX, the following code gives the expected results: there is 
probably something wrong with XeLaTeX, but I cannot find what.

%%%%%%%%%%%%%% CODE %%%%%%%%%%%%%%

Should be An: \kern2019sp A\ifnum\lastkern=2019 y\else n\fi\par

Should be An: \kern2019sp A\relax\ifnum\lastkern=2019 y\else n\fi

\bye

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


Best.

Christian Tellechea