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Proof step 2 from proof inv-isbad (previous step)

n < # apebs, ubi-io-inv(apebs) ⊦ ⟪aubi_io_isbad#(n, apebs; ; isbad, err)⟫ true

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 3:
n < # apebs, ubi-io-inv(apebs) ⊦ ⟪if ubi-io-isbad-pre(n, apebs) then {fail_or_success#(; ; err); if err = ESUCCESS then isbad := apebs[n].bad else isbad := ?} else abort⟫ true

Rule argument

pos: right 1

Additional information

Used simplifier rules: isbad: ⊦ ;