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Proof step 30 from proof fix2rest-last (previous step)

# bytes ≤ 2, bytes2int(bytes) < 0 ⊦ bytes = [], (mklist(i2b(~1), 2 - # bytes) + bytes).rest = bytes.last '

User applied rule insert elim lemma

And obtained the following new goals

Proof step 31:
bytes = bytes0 + by ', # bytes ≤ 2, bytes2int(bytes) < 0 ⊦ bytes = [], (mklist(i2b(~1), 2 - # bytes) + bytes).rest = by '

Rule argument

seq: bytes ≠ [] ⊦ by = bytes.last ∧ bytes0 = bytes.butlast ↔ bytes = bytes0 + by ' subst: [bytes, by, bytes0] → [bytes, by, bytes0] rotate: T spec: list-last inst: bytelist name: last-elim

Additional information

Used simplifier rules: bytes ≠ [] ⊦ by = bytes.last ∧ bytes0 = bytes.butlast ↔ bytes = bytes0 + by '; (elim) Used terms: bytes, by, bytes0