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doc-src/TutorialI/Trie/document/Option2.tex
author
wenzelm
Sun, 25 Jun 2000 23:48:32 +0200
changeset 9127
b1dc56410b63
parent 8771
026f37a86ea7
child 9145
9f7b8de5bfaf
permissions
-rw-r--r--
exception OUTPUT_FAIL of (string * Position.T) * exn (*note: actually belongs to isar_output.ML*);
\begin{isabelle}%
\isanewline
\isacommand{datatype}~'a~option~=~None~|~Some~'a\end{isabelle}%