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

do nat pass theory value, but sg_ref;

\begin{isabelle}%
%
\begin{isamarkuptext}%
\noindent
The type \isaindexbold{nat} of natural numbers is predefined and
behaves like%
\end{isamarkuptext}%
\isacommand{datatype}~nat~=~{"}0{"}~|~Suc~nat\end{isabelle}%
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