Mercurial Mercurial > repos > isabelle / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc-src/Tutorial/Datatype/lookup
author wenzelm
Fri, 12 Oct 2001 12:09:21 +0200
changeset 11731 1a0c1ef86518
parent 5851 15ce4c1c8313
permissions -rw-r--r--
added trace_rules, trace;

consts   lookup :: ('a,'v)trie => 'a list => 'v option
primrec "lookup t [] = value t"
        "lookup t (a#as) = (case assoc (alist t) a of
                              None => None
                            | Some at => lookup at as)"
isabelle