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Proof step 3 from proof newrefs-butlast-01 (previous step)

⊦ newref_list(1, st) .butlast = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ newref_list(1, st) = newref(st) '

Rule argument

[crewrite-arg: newrefs-one-01, F, [st] → [st]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ r ' .butlast = []])], [EXTRATERMS : (st)]]