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Proof step 5 from proof inv-erase (previous step)

m < # avols[v], ebm-cons(avols), v ∈ avols ⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then avols[v][m] := erased else {skip or avols[v][m] := unmapped}⟫ ebm-cons(avols)

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 6:
m < # avols[v], ebm-cons(avols), v ∈ avols ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err = ESUCCESS then avols[v][m] := erased else {skip or avols[v][m] := unmapped}⟫ ebm-cons(avols)

Rule argument

pos: right 1

Additional information

Used simplifier rules: fail_or_success#(; ; ERR) {choose ERR0 with ⌊ERR0⌋ ∨ ERR0 = ESUCCESS in ERR := ERR0};