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Proof step 3 from proof encode-contract (previous step)

buf0 = buf, n + ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪encode_nonempty#(a, n; buf; err)⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ # buf = # buf0 ∧ subarray(buf, 0, n) = subarray(buf0, 0, n) ∧ subarray(buf, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) = subarray(buf0, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf, n, ENCODED_ELEM_SIZE))))

Heuristic nonrecursive calls applied rule call right

And obtained the following new goals

Proof step 4:
⊦
Proof step 5:
buf0 = buf, n + ENCODED_ELEM_SIZE ≤ # buf ⊦ ⟪let m = ? in {encode#(a, n; buf, m; err); if err = ESUCCESS ∧ isempty(buf, n, m) then {debug#("encoding_nonempty: encoding is empty"); err := EINVAL}}⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ # buf = # buf0 ∧ subarray(buf, 0, n) = subarray(buf0, 0, n) ∧ subarray(buf, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) = subarray(buf0, n + ENCODED_ELEM_SIZE, # buf - n + ENCODED_ELEM_SIZE) ∧ (err = ESUCCESS → is-encoded-nonempty(a, subarray(buf, n, ENCODED_ELEM_SIZE))))

Rule argument

pos: right 1

Additional information

Used simplifier rules: encode: ⊦ ;