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Proof step 1 from proof get-last-nonempty (conclusion)

⊦ n = # x - 1 ∧ 0 < # x → x[n] = x.last

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ x[# x - 1] = x.last, x = []

Rule argument

Additional information

Used simplifier rules: l: ⊦ # x = 0 ↔ x = []; from specification list-data%zero: ⊦ 0 < m ↔ m ≠ 0; from specification nat-basic1