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

fixed subgoal_tac; fails on non-existent subgoal;

%
\begin{isabellebody}%
\def\isabellecontext{fakenat}%
\isamarkupfalse%
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\begin{isamarkuptext}%
\noindent
The type \tydx{nat} of natural
numbers is predefined to have the constructors \cdx{0} and~\cdx{Suc}.  It  behaves as if it were declared like this:%
\end{isamarkuptext}%
\isamarkuptrue%
\isacommand{datatype}\ nat\ {\isacharequal}\ {\isadigit{0}}\ {\isacharbar}\ Suc\ nat\isamarkupfalse%
\isamarkupfalse%
\end{isabellebody}%
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