[pstricks] pstricks-add bug

[وفا خلیقی]

trying the following example in Plain TeX,

%%%%%%%%%%%%%%%%%%%%%%%%%%
\input pstricks
\input pstricks-add
Test
\end
%%%%%%%%%%%%%%%%%%%%%%%%%

You will get the following error

%%%%%%%%%%%%%%%%%%%%%%%%%%%
Runaway definition?
#1#2#3#4#5->\expandafter
! Forbidden control sequence found while scanning definition of \XKV at d@f at ne
@b at o
lkey.
<inserted text>
                }
<to be read again>
                   \newif
l.448   \expandafter\newif
                          \csname if#3\endcsname
?

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-- 
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