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doc-src/Tutorial/Datatype/triemain.ML
changeset 15338
08519594b0e4
parent 15337
628d87767434
child 15339
a7b603bbc1e6
equal
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15337:628d87767434
15338:08519594b0e4
1
Goal "!t v bs. lookup (update t as v) bs = \
2
\ (if as=bs then Some v else lookup t bs)";