Fixbytes.fbe4: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/math/typed/fixbytes.bend as Fixbytes
Lines 195-200 of bend-collections-laws-math@1.0.0.0/proofs/math/typed/fixbytes.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/math/typed/fixbytes.bend&start_line=195&end_line=200

import Base
import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as C
import bend-collections-laws-math@1.0.0.0/spec/math/generic.bend as SG
import bend-collections-laws-math@1.0.0.0/spec/math/fixed.bend as SF
import bend-collections-laws-math@1.0.0.0/src/math/fixed.bend as F

def fbe4(+b3: U32, +b2: U32, +b1: U32, +b0: U32, t: List<&2, U32>) -> {SF.mval(~U32, ~SG.u32_val, F.u32_from_bytes_be(Con{b3, Con{b2, Con{b1, Con{b0, t}}}})) == SF.from_le(4n, C.reverse(Nat, SF.nats(Con{b3, Con{b2, Con{b1, Con{b0, t}}}}))) : Maybe<&2, Nat>}:
  match t:
    case Nil{}:
      from4_ok(b0, b1, b2, b3)
    case Con{+b4, t5}:
      Equal.sym(Maybe<&2, Nat>, SF.from_le(4n, C.reverse(Nat, SF.nats(Con{b3, Con{b2, Con{b1, Con{b0, Con{b4, t5}}}}}))), None{}, rev_none(4n, SF.nats(Con{b3, Con{b2, Con{b1, Con{b0, Con{b4, t5}}}}}), {==}))

Uses (13):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Equal.sym
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  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=bend-collections-laws-math@1.0.0.0/proofs/math/typed/fixbytes.bend&name=from4_ok
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/proofs/math/typed/fixbytes.bend&name=rev_none
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&name=reverse
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/fixed.bend&name=from_le
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/fixed.bend&name=mval
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/fixed.bend&name=nats
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/math/generic.bend&name=u32_val
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/src/math/fixed.bend&name=u32_from_bytes_be