law truncate_view_t

lawful-bytes@0.1.1.0 · proof_ops.bend:245

import Base
import lawful-bytes@0.1.1.0/defs.bend as D
import lawful-bytes@0.1.1.0/bytes.bend as B
import lawful-bytes@0.1.1.0/proof_core.bend as C
import lawful-arrays@0.1.0.0/proof_tree.bend as P

245law truncate_view_t:
246  for +len: U32
247  for +t: P.Tree<U32>
248  for +n: U32
249  for +h: {Nat.is_le(U32.to_nat(n), D.size(C.BT(len, t))) == True{} : Bool}
250  {D.view(B.truncate(C.BT(len, t), n)) == List.take(&2, U32, D.view(C.BT(len, t)), U32.to_nat(n)) : List<&2, U32>}