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Proof step 34 from proof prepost-write-superblock (previous step)

avol0 = avol, ebm-vol-inv(avol) ⊦ ⟪err := ENOSPC⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ebm-vol-inv(avol) ∧ (err = ESUCCESS → id○(avol, avol0, 0) ∧ (∃ buf. is-encoded(sb, buf) ∧ avol[0] = mapped(buf))) ∧ (err ≠ ESUCCESS → avol = avol0)), # avol = 0, encoding-size(sb, EB_PAGE_SIZE) ≤ LEB_SIZE

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ n ↔ ¬ n < m; (ss)% ⊦ ESUCCESS ≠ ENOSPC; (s)% ⊦ ⌊ENOSPC⌋ ; (s)