doc-src/TutorialI/Trie/document/Option2.tex
author wenzelm
Mon, 08 May 2000 11:13:28 +0200
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permissions -rw-r--r--
improved indexing;
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\begin{isabelle}%
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\isanewline
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\isacommand{datatype}~'a~option~=~None~|~Some~'a\end{isabelle}%