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Proof step 6 from proof inv-write-vidhdr (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
apebs[n] = mkpeb(aehdr, empty, buf, m, false), avhdr.valid?, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then apebs[n].vidhdr := avhdr else choose avhdr with ¬ avhdr.valid? in apebs[n].vidhdr := avhdr⟫ ubi-io-inv(apebs)

Rule argument

Additional information

Used simplifier rules: ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).bad ↔ boolvar; (s)% ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).echdr = aehdr; (s)% ⊦ mkpeb(aehdr, avhdr, buf, m, boolvar).vidhdr = avhdr; (s)%⊦ ubi-io-write-vidhdr-pre(n, avhdr, apebs) ↔ n < # apebs ∧ ¬ apebs[n].bad ∧ avhdr.valid? ∧ apebs[n].echdr.valid? ∧ apebs[n].vidhdr = empty; (s)