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Proof step 23 from proof test (previous step)

buf = mk(mkarray(2)[0, a][1, b][0, c], 2, 1, 2) ⊦ ⟪get#(buf .first, buf .data; a0)⟫ ⟪buf0 := buf .first:= ((buf .first + 1) % buf .size) ; buf0 := buf0 .len:= (buf0 .len - 1)⟫ ⟪assert#(a0 = b) ; pop#(; buf0, a0) ; assert#(a0 = c)⟫ true

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 22:
buf = mk(mkarray(2)[0, a][1, b][0, c], 2, 1, 2) ⊦ ⟪a := a0, ar := buf .data, i := buf .first⟫ ⟪if 0 ≤ i ∧ i < n→i(# ar) then a := ar[i→n(i)] else abort⟫ ⟪buf0 := buf .first:= ((buf .first + 1) % buf .size) ; buf0 := buf0 .len:= (buf0 .len - 1)⟫ ⟪assert#(a = b) ; pop#(; buf0, a) ; assert#(a = c)⟫ true

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 }])]]