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theory trace_simp = Main:
text {*
this produces massive amount of simplifier trace, but terminates
eventually: *}
ML {* set trace_simp *}
ML {* reset quick_and_dirty *}
datatype ord = Zero | Succ ord | Limit "nat => ord"
text {* this one loops forever *}
lemma "ALL x. f x = g(f(g(x))) ==> f [] = f [] @ []"
apply simp
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