doc-src/TutorialI/Misc/document/fakenat.tex

fully enclose "\isadigit{...}";
\<^foo> produces "\isactrlfoo ";

%
\begin{isabellebody}%
\def\isabellecontext{fakenat}%
%
\begin{isamarkuptext}%
\noindent
The type \isaindexbold{nat}\index{*0|bold}\index{*Suc|bold} of natural
numbers is predefined and behaves like%
\end{isamarkuptext}%
\isacommand{datatype}\ nat\ {\isacharequal}\ \isadigit{0}\ {\isacharbar}\ Suc\ nat\end{isabellebody}%
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