LAWS.fast_append_view: law of lawful-bytes@0.1.1.0
Import: import lawful-bytes@0.1.1.0/LAWS.bend as LAWS
Lines 460-473 of lawful-bytes@0.1.1.0/LAWS.bend: https://jend.leeeet.dev/read.txt?path=lawful-bytes@0.1.1.0/LAWS.bend&start_line=460&end_line=473

import Base
import lawful-bytes@0.1.1.0/defs.bend as D
import lawful-bytes@0.1.1.0/fast.bend as FA

# The word-at-a-time append writes whole words, so up to 3 bytes past the new
# length differ from the reference's: its laws are append's, on the view.
law fast_append_view:
  for dst: D.Bytes
  for src: D.Bytes
  for d: Nat
  for e: Nat
  for s: U32
  for n: U32
  for hd: {D.ok(dst, d) == True{} : Bool}
  for he: {D.ok(src, e) == True{} : Bool}
  for hs: {Nat.is_le(Nat.add(U32.to_nat(s), U32.to_nat(n)), D.size(src)) == True{} : Bool}
  for hc: {Nat.is_le(Nat.add(D.size(dst), U32.to_nat(n)), D.cap(dst)) == True{} : Bool}
  {D.view(Pair.fst(D.Bytes, D.Bytes, FA.append(dst, src, s, n))) == List.append(&2, U32, D.view(dst), D.slice(D.view(src), U32.to_nat(s), U32.to_nat(n))) : List<&2, U32>}

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=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.append
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.is_le
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair.fst
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/PROOF.bend&name=fast_append_view.go
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=cap
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=ok
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=size
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=slice
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/defs.bend&name=view
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/fast.bend&name=append
  https://jend.leeeet.dev/definition.txt?path=lawful-bytes@0.1.1.0/proof_core.bend&name=bmirror