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Proof step 7 from proof inv-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then apebs[n].echdr := aehdr else choose aehdr with ¬ aehdr.valid? in apebs[n].echdr := aehdr⟫ ubi-io-inv(apebs)

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 8:
apebs[n] = mkpeb(empty, avhdr, buf, m, false), aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err = ESUCCESS then apebs[n].echdr := aehdr else choose aehdr with ¬ aehdr.valid? in apebs[n].echdr := aehdr⟫ ubi-io-inv(apebs)

Rule argument

pos: right 1

Additional information

Used simplifier rules: fail_or_success#(; ; ERR) {choose ERR0 with ⌊ERR0⌋ ∨ ERR0 = ESUCCESS in ERR := ERR0};