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Proof step 13 from proof head-corr (previous step)

buf .len = 1 + n→i(# x), a ' + x = tolist(buf, i→n(buf .len)), inv(buf) ⊦ 〈get#(buf .first, buf .data; a0)〉 a = a0

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 12:
buf .len = 1 + n→i(# x), a ' + x = tolist(buf, i→n(buf .len)), inv(buf) ⊦ 〈a1 := a0, ar := buf .data, i := buf .first〉〈if 0 ≤ i ∧ i < n→i(# ar) then a1 := ar[i→n(i)] else abort〉 a = a1

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPDECL : get# (i, ar; a) { if 0 ≤ i ∧ i < n→i(# ar) then a := ar[i→n(i)] else abort }])]]