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Proof step 5 from proof refine-destroy-buf (previous step)

# avol0 = # avol, # lpt0 = # avol, # buf = EB_PAGE_SIZE, bleb0 = bleb, abs(avol, bleb, mkwbuf(buf, m, m1), avol0, rofs), awbuf-inv(avol, bleb), ebm-vol-inv(avol0), synced(avol), bleb ≠ nobuffer → bleb.leb < # avol ∧ wbuf-cons(mkwbuf(buf, m, m1), avol0[bleb.leb], rofs) ⊦ ⟪wbuf_destroy_buf#(rofs; bleb; err)⟫ ⟨awbuf_destroy_buf#(adr0, m0, plog0, avol, lpt0, ns0, rofs; bleb0; err0)⟩ (abs(avol, bleb, mkwbuf(buf, m, m1), avol0, rofs) ∧ bleb0 = bleb ∧ err = err0)

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 6:
# buf = EB_PAGE_SIZE, # lpt0 = # avol, # avol0 = # avol, bleb0 = bleb, abs(avol, bleb, mkwbuf(buf, m, m1), avol0, rofs), awbuf-inv(avol, bleb), ebm-vol-inv(avol0), synced(avol), bleb ≠ nobuffer → bleb.leb < # avol ∧ wbuf-cons(mkwbuf(buf, m, m1), avol0[bleb.leb], rofs) ⊦ ⟪if rofs then err := EROFS else {bleb := nobuffer; err := ESUCCESS}⟫ ⟨awbuf_destroy_buf#(adr0, m0, plog0, avol, lpt0, ns0, rofs; bleb0; err0)⟩ (abs(avol, bleb, mkwbuf(buf, m, m1), avol0, rofs) ∧ bleb0 = bleb ∧ err = err0)

Rule argument

pos: right 1

Additional information

Used simplifier rules: wbuf_destroy_buf#(ROFS; BUFLEB; ERR) {if ROFS then ERR := EROFS else {BUFLEB := nobuffer; ERR := ESUCCESS}};