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

# lpt = # avol, awbuf-inv(avol, bleb), synced(avol) ⊦ ⟪if isbuf then err := EROFS else bleb := nobuffer, err := ESUCCESS⟫ awbuf-inv(avol, bleb)

Heuristic conditional right split applied rule if right

And obtained the following new goals

Proof step 6:
# lpt = # avol, isbuf, awbuf-inv(avol, bleb), synced(avol) ⊦ ⟪err := EROFS⟫ awbuf-inv(avol, bleb)
Proof step 7:
# lpt = # avol, ¬ isbuf, awbuf-inv(avol, bleb), synced(avol) ⊦ ⟪bleb := nobuffer, err := ESUCCESS⟫ awbuf-inv(avol, bleb)

Rule argument

pos: right 1

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