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Proof step 5 from proof crash-neutral-write-echdr (previous step)

apebs[n] = mkpeb(empty, avhdr, buf, m, false), apebs0 = apebs, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟨aubi_io_write_echdr#(n, aehdr; apebs; err)⟩ (apebs0 = apebs)

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 6:
apebs[n] = mkpeb(empty, avhdr, buf, m, false), apebs0 = apebs, aehdr.valid?, n < # apebs, ubi-io-inv(apebs) ⊦ ⟨if ubi-io-write-echdr-pre(n, aehdr, apebs) then {fail_or_success#(; ; err); if err = ESUCCESS then apebs[n].echdr := aehdr else choose aehdr with ¬ aehdr.valid? in apebs[n].echdr := aehdr} else abort⟩ (apebs0 = apebs)

Rule argument

pos: right 1

Additional information

Used simplifier rules: write-echdr: ⊦ ;