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

# refs = # sks, st[r -- sks] .refval = (r ' + refs)[# refs], fits(r, sks, st), validrefs(str, r ' + refs, st[r -- _type] .type, st) ⊦ (r ' + refs)[# refs] = (r ' + refs) .last, sks = [], junkref(str, r, st)

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] → [refs, r] ,F ,list-del ,references-olista ,get-last2 ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (refs, r)]]