def p_at_append_lt

bend-osdev-bytes@0.1.1.0 · PROOF.bend:1254

import Base
import bend-osdev-bytes@0.1.1.0/bytes.bend as B

1254def p_at_append_lt(+a: B.Octets, +b: B.Octets, +i: Nat) -> {Nat.is_lt(i, B.Octets.len(a)) == True{} : Bool} -> {B.Octets.at(B.Octets.append(a, b), i) == B.Octets.at(a, i) : Maybe<&2, U32>}:
1255  match a b:
1256    case B.Octets{+xs} B.Octets{+ys}:
1257      h => q_at_app_lt(i, xs, ys, off.len_fast_lt(i, xs, h))