\bgroup \tabskip \z@skip \@arstrut \@preamble
\tabskip \z@ \cr}%
\endgroup
- \@arrayleft\typeout{\meaning\@begin@alignbox, \meaning\box@dir}
+ \@arrayleft
\@begin@alignbox\bgroup\box@dir\adjustbaseline
\let\par\@empty
\let\@sharp####\let\protect\relax