for extraction -- use the exhaust rule that's registered with 'datatype_realizer.ML'
for extraction -- use the exhaust rule that's registered with 'datatype_realizer.ML'

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle