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Proof step 4 from proof inv-get-volume-size (previous step)

v = default-volid, ebm-cons(avols), default-volid ∈ avols ⊦ ⟪ebm_get_volume_size#(v, avols; ; n)⟫ true

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 5:
v = default-volid, ebm-cons(avols), default-volid ∈ avols ⊦ ⟪if v ∈ avols then n := # avols[v] else abort⟫ true

Rule argument

pos: right 1

Additional information

Used simplifier rules: ebm_get_volume_size#(VOLID, AVOLS; ; N) {if VOLID ∈ AVOLS then N := # AVOLS[VOLID] else abort};