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Proof step 8 from proof okbytearray-is-byte (previous step)

okbytearray(st[r -- sks] .refval, st), i < st[r -- (sks + _length ')] .intval, 0 ≤ i, 0 < st[r -- (sks + _length ')] .intval ⊦ sks = [], is_bytevalue(st[r -- (sks + i ' ')])

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ sks ≠ [] → st[r -- (sks + sk ')] = st[st[r -- sks] .refval -- sk]
Proof step 7:
sks ≠ [], okbytearray(st[r -- sks] .refval, st), i < st[r -- (sks + _length ')] .intval, 0 ≤ i, 0 < st[r -- (sks + _length ')] .intval ⊦ sks = [], is_bytevalue(st[st[r -- sks] .refval -- i '])

Rule argument

[speclemmaarg: ,sks ≠ [] → st[r -- (sks + sk ')] = st[st[r -- sks] .refval -- sk] ,[sk, sks, r, st] → [i ', sks, r, st] ,F ,storefuns , ,lookup-last-rec ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (i ', sks, r, st)]]