renamed ML-Systems/multithreading_dummy.ML to ML-Systems/multithreading.ML;
replaced interrupt_timeout by TimeLimit.timeLimit (available on SML/NJ and Poly/ML 5.1);
(*<*)
theory fakenat imports Main begin;
(*>*)
text{*\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:
*}
datatype nat = 0 | Suc nat
(*<*)
end
(*>*)