[XeTeX] Odd XeTeX behaviior...

[Stephen Moye]

The following file outputs almost nothing if the line indicated is commented out. Curious -- is this a bug?

%%%%%%%%%%

\def\reflect#1{{\setbox0=\hbox{#1}\rlap{\kern0.5\wd0
  \special{x:gsave}\special{x:scale -1 1}}\box0 \special{x:grestore}}}
  
Some tests %% Comment this entire line and there is no output except for one R!

\noindent\setbox1=\hbox{\reflect{R}IP First}\box1

\noindent\reflect{R}IP

\leavevmode\hbox{\reflect{R}IP Second}

Some tests

\bye