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Proof step 17 from proof refine-get-gc-block (previous step)

syn ↔ syn0, fi = fi1, fi0 = fi2, ginval = ginval2, gstore = gstore2, maxino = maxino0, n0 = n1, nx = nx0, 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), n ∈ gstore2, n ∈ gstore0, istore1 ⊑ istore2, pstate.journal? → nx0 ≠ [] ∧ pstate.lnum = nx0.last ∧ pstate.lnum ∈ gstore0, pstate.index? → pstate.lnum ∈ istore2, pstate = unbuffered → syn0 ⊦ ⟨err := ENOSPC or choose n with n ∈ dom gstore0 ∧ ¬ n ∈ nx in {n0 := n; err := ESUCCESS} ifnone err := ENOSPC⟩ (n = n0 ∧ ESUCCESS = err), dups(nx0), n ∈ nx0

Heuristic symbolic execution applied rule or right

And obtained the following new goals

Rule argument

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