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Proof step 21 from proof harness-1 (previous step)

to3 = fail, x0 = 2 ', x1 = x0 ∧ d0 = 2, h0 = head(x1) ⊦ 〈if h0 < d0 then to := fail else if h0 = d0 then { x1 := pop(x1) ; to := some(Leaf) } else let to0 = fail, to1 = fail in { build_rec#(d0 + 1; x1, to0) ; if to0 = fail then to := fail else { build_rec#(d0 + 1; x1, to1) ; if to1 = fail then to := fail else to := some(Node(to0 .t, to1 .t)) } }〉〈to3 := to ; if to3 = fail then to := fail else to := some(Node(Node(Leaf, Leaf), to3 .t))〉〈to5 := to ; if to5 = fail then to0 := fail else to0 := some(Node(Leaf, to5 .t))〉〈to1 := to0 ; if x1 ≠ [] 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 20:
to3 = fail, x0 = 2 ', x1 = x0 ∧ d0 = 2, h0 = head(x1) ⊦ 〈if h0 = d0 then { x1 := pop(x1) ; to := some(Leaf) } else let to0 = fail, to1 = fail in { build_rec#(d0 + 1; x1, to0) ; if to0 = fail then to := fail else { build_rec#(d0 + 1; x1, to1) ; if to1 = fail then to := fail else to := some(Node(to0 .t, to1 .t)) } }〉〈to3 := to ; if to3 = fail then to := fail else to := some(Node(Node(Leaf, Leaf), to3 .t))〉〈to5 := to ; if to5 = fail then to0 := fail else to0 := some(Node(Leaf, to5 .t))〉〈to1 := to0 ; if x1 ≠ [] then to1 := fail〉 to1 = some(Node(Leaf, Node(Node(Leaf, Leaf), Leaf)))

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ head(d ') = d])]]