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Proof step 28 from proof harness-1 (previous step)

x = 3 ' + 2 ', to6 = fail, x2 = x ∧ d0 = 3, h0 = head(x2), to2 = some(Node(Leaf, some(Leaf) .t)) ∧ x0 = pop(x2) ⊦ 〈if to2 = fail then to := fail else { to6 := fail ; build_rec#(2; x0, to6) ; if to6 = fail then to := fail else to := some(Node(to2 .t, to6 .t)) }〉〈to5 := to ; if to5 = fail then to0 := fail else to0 := some(Node(Leaf, to5 .t))〉〈to1 := to0 ; if x0 ≠ [] then to1 := fail〉 to1 = some(Node(Leaf, Node(Node(Leaf, Leaf), Leaf)))

Heuristic symbolic execution applied rule if negative right

And obtained the following new goals

Proof step 27:
x = 3 ' + 2 ', to6 = fail, x2 = x ∧ d0 = 3, h0 = head(x2), to2 = some(Node(Leaf, some(Leaf) .t)) ∧ x0 = pop(x2) ⊦ 〈to6 := fail〉〈build_rec#(2; x0, to6)〉〈if to6 = fail then to := fail else to := some(Node(to2 .t, to6 .t))〉〈to5 := to ; if to5 = fail then to0 := fail else to0 := some(Node(Leaf, to5 .t))〉〈to1 := to0 ; if x0 ≠ [] then to1 := fail〉 to1 = some(Node(Leaf, Node(Node(Leaf, Leaf), Leaf)))

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ some(t) .t = t], [CSIMPSEQ : ⊦ fail ≠ some(t)])]]