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doc-src/Tutorial/Misc/Tree.thy
author
paulson
Fri, 18 Sep 1998 14:32:49 +0200
changeset 5494
2df1a9d43e3c
parent 5377
efb799c5ed3c
permissions
-rw-r--r--
improved error messages
Tree = Main +
datatype 'a tree = Tip | Node ('a tree) 'a ('a tree)
end