PROOF.h.sz_del_hit: def of bend-kit-collections@0.1.4.1
Import: import bend-kit-collections@0.1.4.1/PROOF.bend as PROOF
Lines 3601-3624 of bend-kit-collections@0.1.4.1/PROOF.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&start_line=3601&end_line=3624

import Base
import bend-kit-collections@0.1.4.1/hmap.bend as M

def h.sz_del_hit(
  ~K: Data, ~V: Data, ~eq: K -> K -> Bool, n: Nat, +mask: U32, m: M.HMap<K, V>, +hk: U32, +k: K, -w: V,
  hit: {h.G(~K, ~V, ~eq, n, mask, m, hk, k) == Some{w} : Maybe<&2, V>}
) -> {1n+h.Sz(K, V, h.D(~K, ~V, ~eq, n, mask, m, hk, k)) == h.Sz(K, V, m) : Nat}:
  match n:
    case 0n:
      match m:
        case M.HNil{}:
          h.none_some({1n == 0n : Nat}, V, w, hit)
        case M.HLeaf{+o, +es}:
          %h.size_leaf(K, V, o, M.HMap.entries.del(~K, ~V, ~eq, es, k)) : {1n+_ == h.len(K, V, es) : Nat}
          h.elen_del_hit(~K, ~V, ~eq, es, k, w, hit)
        case M.HBranch{+lo, +hi}:
          h.none_some({1n+h.Sz(K, V, M.HBranch{lo, hi}) == h.Sz(K, V, M.HBranch{lo, hi}) : Nat}, V, w, hit)
    case 1n+(+p):
      match m:
        case M.HNil{}:
          h.none_some({1n == 0n : Nat}, V, w, hit)
        case M.HLeaf{+o, +es}:
          h.sz_del_hit.lf(~K, ~V, ~eq, o, es, hk, k, w, U32.is_eq(o, hk), {==}, hit)
        case M.HBranch{+lo, +hi}:
          h.sz_del_hit.br(~K, ~V, ~eq, p, mask, lo, hi, hk, k, w, U32.is_eq((hk .&. mask : U32), 0), {==}, hit,
            e => h.sz_del_hit(~K, ~V, ~eq, p, (mask << 1n : U32), lo, hk, k, w, e),
            e => h.sz_del_hit(~K, ~V, ~eq, p, (mask << 1n : U32), hi, hk, k, w, e))

Uses (18):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shln
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.D
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.G
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.Sz
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.elen_del_hit
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.len
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.none_some
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.size_leaf
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.sz_del_hit.br
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/PROOF.bend&name=h.sz_del_hit.lf
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/hmap.bend&name=HMap
  https://jend.leeeet.dev/definition.txt?path=bend-kit-collections@0.1.4.1/hmap.bend&name=HMap.entries.del