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% $Id: test-shipout.tex 910 2023-08-26 17:47:24Z karl $
% Public domain. Originally by Phelype Oleinik, 2023.
% Test `shipout' keyword on \special and \pdfliteral to delay expansion.

\catcode`\{=1 \catcode`\}=2
\output={\global\advance\count0 by 1 \shipout\box255 }

\pdfoutput=1
\pdfcompresslevel=0
\pdfobjcompresslevel=0
\hsize=4.6cm
  \pdfpagewidth=\hsize
  \hoffset=-1in
\topskip=10pt
\baselineskip=12pt
\vsize=\dimexpr\topskip+3\baselineskip\relax
  \pdfpageheight=\vsize
  \voffset=-1in
\parindent=0pt

\font\f = cmr10 \f

\def\!{\ifodd\count0 0\else 1\fi}
\def\0{\pdfliteral {0 g}}

\def\text{%
  \pdfliteral         direct {\! 1 0 0 k}1hello\01 %
  \special              {PDF:direct:\! g}2hello\02 %
  \pdfliteral shipout direct {\! 1 0 0 k}3hello\03 %
  \special    shipout   {PDF:direct:\! g}4hello\04 %
}

\text \text \text \text
\text \text \text \text
\text \text \text \text
\text \text \text \text

\end