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Proof step 11 from proof fix2rest-last (previous step)

2 ≤ # bytes ⊦ lastn(2, bytes).rest = bytes.last ', bytes = [], ¬ 2 < # bytes ∧ ¬ bytes2int(bytes) < 0, ¬ 2 < # bytes ∧ ¬ 0 ≤ bytes2int(bytes)

User applied rule case distinction

And obtained the following new goals

Proof step 12:
2 ≤ # bytes ⊦ ¬ 2 < # bytes, lastn(2, bytes).rest = bytes.last ', bytes = [], ¬ 2 < # bytes ∧ ¬ 0 ≤ bytes2int(bytes)
Proof step 15:
2 ≤ # bytes ⊦ ¬ bytes2int(bytes) < 0, lastn(2, bytes).rest = bytes.last ', bytes = [], ¬ 2 < # bytes ∧ ¬ 0 ≤ bytes2int(bytes)

Rule argument

pos: right 3

Additional information