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Proof step 9 from proof harness-2 (previous step)

x = 2 ' + 2 ', to6 = fail, x2 = x ∧ d0 = 3, h0 = head(x2), to2 = fail ∧ x0 = x2, to = fail ⊦ 〈if x0 ≠ [] then to := fail〉 to = fail

Heuristic symbolic execution applied rule if positive right

And obtained the following new goals

Proof step 8:
x = 2 ' + 2 ', to6 = fail, x2 = x ∧ d0 = 3, h0 = head(x2), to2 = fail ∧ x0 = x2, to = fail ⊦ 〈to := fail〉 to = fail

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ d ' + x ≠ []], [CSIMPSEQ : ⊦ (x + y) + z = x + y + z])]]