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Proof step 6 from proof inv-read-buf (previous step)

# lpt = # avol, avol[m3] = mapped(buf1), m3 < # avol, awbuf-inv(avol, bleb), m0 + n ≤ LEB_SIZE, n ≤ # buf ⊦ ⟪fail_or_success#(; ; err); if err = ESUCCESS then buf := copy(avol[m3].data + mkempbuf(LEB_SIZE - # avol[m3].data), m0, buf, 0, n) else choose buf1 with # buf1 = # buf ∧ range=(buf1, n, buf, n, # buf - n) in buf := buf1⟫ true

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 7:
# lpt = # avol, avol[m3] = mapped(buf1), m3 < # avol, awbuf-inv(avol, bleb), n ≤ # buf, m0 + n ≤ LEB_SIZE ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; if err = ESUCCESS then buf := copy(avol[m3].data + mkempbuf(LEB_SIZE - # avol[m3].data), m0, buf, 0, n) else choose buf1 with # buf1 = # buf ∧ range=(buf1, n, buf, n, # buf - n) in buf := buf1⟫ true

Rule argument

pos: right 1

Additional information

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