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doc-src/Tutorial/Datatype/lookupempty.ML
author nipkow
Thu, 06 Jul 2000 09:46:56 +0200
changeset 9255 2ceb11a2e190
parent 5851 15ce4c1c8313
permissions -rw-r--r--
*** empty log message ***
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
5851
15ce4c1c8313 New section on advanced datatypes.
nipkow
parents:
diff changeset 
     1
 
Goal "lookup (Trie None []) as = None";
9255
2ceb11a2e190 *** empty log message ***
nipkow
parents: 5851
diff changeset 
     2
 
by(case_tac "as" 1);
5851
15ce4c1c8313 New section on advanced datatypes.
nipkow
parents:
diff changeset 
     3
 
by(Auto_tac);
isabelle