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

⊦ ⟪aubi_io_format#(; ; apebs, err)⟫ (err = ESUCCESS → ubi-io-inv(apebs))

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 3:
⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then choose apebs0 with ubi-io-initial(apebs0) in apebs := apebs0 else apebs := ?⟫ (err = ESUCCESS → ubi-io-inv(apebs))

Rule argument

pos: right 1

Additional information

Used simplifier rules: format: ⊦ ;