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Proof step 3 from proof ex-validrefs-fits (previous step)

# sks = # refs0, st[r -- sks] .refval = (r ' + refs0)[# refs0], validrefs(str, r ' + refs0, ty, st), fits(r, sks, st) ⊦ refs0 = [], (r ' + refs0)[# refs0] = refs0 .last

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ (r ' + refs)[# refs] = (r ' + refs) .last

Rule argument

[speclemmaarg: ,(r ' + refs)[# refs] = (r ' + refs) .last ,[refs, r] → [refs0, r] ,F ,list-del ,references-olista ,get-last2 ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ refs ≠ [] → (r ' + refs) .last = refs .last], [CSIMPSEQ : ⊦ (refs + refs0) + refs1 = refs + refs0 + refs1])], [EXTRATERMS : (refs0, r)]]