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doc-src/Tutorial/Datatype/triemain.ML
author
wenzelm
Sat, 05 Jun 1999 20:30:29 +0200
changeset 6786
0af1797d5315
parent 5851
15ce4c1c8313
permissions
-rw-r--r--
varifyT': observe additional 'fixed' tfrees;
Goal "!t v bs. lookup (update t as v) bs = \
\ (if as=bs then Some v else lookup t bs)";