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Proof step 6 from proof removed-stays-reachable (previous step)

reachable(r, r0, H[r0, ce]), ce.nxt = H[ce.nxt].nxt, ce.nxt = H[r0].nxt, r0 ∈ H, ce.nxt ∈ H, reachable(r, r0, H) ⊦ ce.nxt = null, reachable(r, ce.nxt, H[r0, ce])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
ce.nxt = H[r0].nxt, ce.nxt = H[ce.nxt].nxt, reachable(r, r0, H), ce.nxt ∈ H, r0 ∈ H, reachable(r, r0, H[r0, ce]) ⊦ ce.nxt = null, reachable(r, ce.nxt, H[r0, ce])

Rule argument

Additional information

Used simplifier rules: reach-alloc: ⊦ reachable(r, r1, H) → r1 ∈ H;%insin: ⊦ r ∈ H[r, ce]; from specification store[linheap]