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doc-src/TutorialI/Trie/document/Option2.tex
author
paulson
Mon, 22 May 2000 12:35:34 +0200
changeset 8917
2ff6f8693c4f
parent 8771
026f37a86ea7
child 9145
9f7b8de5bfaf
permissions
-rw-r--r--
loading the new theory MultisetOrder
\begin{isabelle}%
\isanewline
\isacommand{datatype}~'a~option~=~None~|~Some~'a\end{isabelle}%