PROOF.AP.swap_size: def of bend-osdev-array@0.1.0.1
Import: import bend-osdev-array@0.1.0.1/PROOF.bend as PROOF
Lines 655-665 of bend-osdev-array@0.1.0.1/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-array@0.1.0.1/PROOF.bend&start_line=655&end_line=665

import Base

def AP.swap_size(-T: Data, t: AP.Tree<T>, n: U32, +i: U32, v: T, z: Bool) -> {AP.size(T, AP.swap_t(T, t, n, i, v, z)) == AP.size(T, t) : U32}:
  match t z:
    case APLeaf{x} _:
      {==}
    case APNode{xs, ys} True{}:
      +h = U32.shr(n)
      +z1 = U32.is_lt(i, U32.shr(h))
      %Equal.sym(U32, AP.size(T, AP.swap_t(T, xs, h, i, v, z1)), AP.size(T, xs), AP.swap_size(T, xs, h, i, v, z1)) : {U32.shl(_) == U32.shl(AP.size(T, xs)) : U32}
      {==}
    case APNode{xs, ys} False{}:
      {==}

Uses (9):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_lt
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shl
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shr
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-array@0.1.0.1/PROOF.bend&name=AP.Tree
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-array@0.1.0.1/PROOF.bend&name=AP.size
  https://jend.leeeet.dev/definition.txt?path=bend-osdev-array@0.1.0.1/PROOF.bend&name=AP.swap_t