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% This file is public domain.
%
% Test optional arguments.
\ifx\undefined\eplain \input eplain \fi
\catcode`@ = \letter
\def\foo{\@getoptionalarg\finfoo}
\def\finfoo#1{%
\edef\firstarg{\@optionalarg}
\edef\mandatoryarg{#1}%
\@getoptionalarg\finfinfoo
}
\def\finfinfoo{%
The first optional argument is `\firstarg', the mandatory argument
is `\mandatoryarg', and the second optional argument is `\@optionalarg'.
\par
}
\loggingall
\foo[a {\cite[p.10]{xyz}} b]{mand2}
\foo{mand}
\foo[opt1]{mand}
\foo{mand}[opt2]
\foo[opt1]{mand}[opt2]
\foo[opt1]{mand}
[opt2 on a separate line]
\bye
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