[luatex] bug in RTL typesetting?

[وفا خلیقی]

but can you tell me why this does not work:

%%%%%%%%%%%%%%%%%%%%%%%
\newif\if at RTL
\if at RTL\pagedir TRT \bodydir TRT \pardir TRT \textdir TRT \else \pagedir TLT
\bodydir TLT \pardir TLT \textdir TLT \fi
\def\setRTL{\@RTLtrue}
\def\setLTR{\@RTLfalse}
%%%%%%%%%%%%%%%%%%%%%%%
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