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Proof step 21 from proof refine-get-gc-block (previous step)

remove-refsize0(gstore2) = gstore2, remove-refsize0(istore1) = istore1, elems nx0 ∩ ginval0 = ∅, dom gstore2 ∪ elems nx0 = dom gstore0 ∪ ginval0, btree-inv(rp, adr, istore2, istore1, zh, fi2, fi1), inv(gstore0 \ ginval0), inv(gstore2), inv(istore2), inv(istore1), ri-inj(fi2), ri-inj(fi1), n2 ∈ gstore0, n2 ∈ gstore2, istore1 ⊑ istore2, ¬ dups(nx0), ¬ n2 ∈ nx0, pstate.journal? → nx0 ≠ [] ∧ pstate.lnum = nx0.last ∧ pstate.lnum ∈ gstore0, pstate.index? → pstate.lnum ∈ istore2, pstate = unbuffered → syn0 ⊦ (¬ n ∈ gstore0 ∨ n ∈ nx0) ∧ ⟨err := ENOSPC⟩ (n2 = n0 ∧ ESUCCESS = err), ∃ n1. n1 ∈ gstore0 ∧ ¬ n1 ∈ nx0 ∧ ⟨n0 := n1; err := ESUCCESS⟩ (n2 = n0 ∧ ESUCCESS = err)

Heuristic dl case distinction applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

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