prove_case_equation now calls uses meta_eq_to_obj_eq to cope with new form of 'split'.  Tried calling simp_tac instead of using resolution with trans, but it was significantly slower: 98.3 secs instead of 91.2 secs for ex/Enum.
prove_case_equation now calls uses meta_eq_to_obj_eq to cope
with new form of 'split'.  Tried calling simp_tac instead of using resolution
with trans, but it was significantly slower: 98.3 secs instead of 91.2 secs
for ex/Enum.

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