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Proof step 8 from proof prepost-read-superblock (previous step)

avol[0] = mapped(buf1), # avol ≠ 0, ebm-vol-inv(avol), is-encoded(sb0, buf1) ⊦ ⟪fail_or_success#(; ; err); buf := mkbuf(LEB_SIZE); if err = ESUCCESS then buf := copy(avol[0].data + mkempbuf(LEB_SIZE - # avol[0].data), 0, buf, 0, LEB_SIZE) else {n0 := 0; m2 := LEB_SIZE; choose buf1 with # buf1 = # buf ∧ range=(buf, 0, buf1, 0, n0) ∧ range=(buf, n0 + m2, buf1, n0 + m2, # buf - n0 + m2) in buf := buf1}; if err = ESUCCESS then let m = ? in decode_superblock#(0, buf, EB_PAGE_SIZE; sb, m; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → sb = sb0))

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 9:
avol[0] = mapped(buf1), ebm-vol-inv(avol), is-encoded(sb0, buf1) ⊦ ⟪choose err0 with ⌊err0⌋ ∨ err0 = ESUCCESS in err := err0; buf := mkbuf(LEB_SIZE); if err = ESUCCESS then buf := copy(avol[0].data + mkempbuf(LEB_SIZE - # avol[0].data), 0, buf, 0, LEB_SIZE) else {n0 := 0; m2 := LEB_SIZE; choose buf1 with # buf1 = # buf ∧ range=(buf, 0, buf1, 0, n0) ∧ range=(buf, n0 + m2, buf1, n0 + m2, # buf - n0 + m2) in buf := buf1}; if err = ESUCCESS then let m = ? in decode_superblock#(0, buf, EB_PAGE_SIZE; sb, m; err)⟫ ((err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → sb = sb0)), # avol = 0

Rule argument

pos: right 1

Additional information

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