def truncate_ok.go

lawful-bytes@0.1.1.0 · PROOF.bend:328

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-bytes@0.1.1.0/proof_ops.bend as O

328def truncate_ok.go(-b: D.Bytes, +d: Nat, +n: U32, h: {D.ok(b, d) == True{} : Bool}, hn: {Nat.is_le(U32.to_nat(n), D.size(b)) == True{} : Bool}, m_b: C.BMirror(b)) ->
329  {D.ok(B.truncate(b, n), d) == True{} : Bool}:
330  (+l_b, m2_b) = m_b
331  (+t_b, +e_b) = m2_b
332  %e_b : {D.ok(B.truncate(_, n), d) == True{} : Bool}
333  +h_t = C.tr(x => {D.ok(x, d) == True{} : Bool}, b, l_b, t_b, e_b, h)
334  +hn_t = C.tr(x => {Nat.is_le(U32.to_nat(n), D.size(x)) == True{} : Bool}, b, l_b, t_b, e_b, hn)
335  O.truncate_ok_t(l_b, t_b, d, n, h_t, hn_t)