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Proof step 4 from proof inv-write-echdr (previous step)

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

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 5:
apebs[n] = mkpeb(empty, avhdr, buf, m, false), 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⟫ ubi-io-inv(apebs)

Rule argument

pos: right 1

Additional information

Used simplifier rules: write-echdr: ⊦ ;