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%#!euptex pdfprimitive-test.tex
\catcode`\{=1\catcode`\}=2
\scrollmode
\def\relax{\message{RELAX}}
\def\fuga{\message{FUGA}}
\let\input=\halign

\relax                   % ==> RELAX
\pdfprimitive\relax      % ==> (no output)
\message{\meaning\relax} % ==> macro:->\message {RELAX}

\fuga              % ==> FUGA
\pdfprimitive\fuga % ==> ``! Missing primitive name.'' error

\ifpdfprimitive\relax\message{T}\else\message{F}\fi % ==> F (macro)
\ifpdfprimitive\par\message{T}\else\message{F}\fi   % ==> T
\ifpdfprimitive\input\message{T}\else\message{F}\fi % ==> F
 % (This \input is not ``primitive \input''.)
\ifpdfprimitive\hoge\message{T}\else\message{F}\fi  % ==> F (undefined)
\ifpdfprimitive\fuga\message{T}\else\message{F}\fi  % ==> F (macro)

\show\pdfstrcmp % ==> \pdfstrcmp
\end