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Proof step 3 from proof refine-get (previous step)

prefixn(h, xs + ys) = prefixn(h, xs0), # xs < h, # xs + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟪tree_buffer_get#(h, xs0; ; x)⟫ ⟨caterpillar_get#(h, xs, ys; ; x0)⟩ (x = x0)

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 4:
prefixn(h, xs1 + ys) = prefixn(h, xs0), xs = xs0, # xs1 < h, # xs1 + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟪x := prefixn(h, xs)⟫ ⟨caterpillar_get#(h, xs1, ys; ; x0)⟩ (x = x0)

Rule argument

pos: right 1

Additional information

Used simplifier rules: tree_buffer_get#(h, xs; ; x){x := prefixn(h, xs)};