Defs.within: def of lawful-fields@0.1.1.0
Import: import lawful-fields@0.1.1.0/defs.bend as Defs
Lines 103-109 of lawful-fields@0.1.1.0/defs.bend: https://jend.leeeet.dev/read.txt?path=lawful-fields@0.1.1.0/defs.bend&start_line=103&end_line=109

import Base

# Every offset in es lies in from .. to.
def within(es: List<&2, U32>, +from: Nat, +to: Nat) -> Bool:
  match es:
    case Nil{}:
      True{}
    case Con{+e, t}:
      (Nat.is_le(from, U32.to_nat(e)) && Nat.is_le(U32.to_nat(e), to)) && within(t, from, to)

Uses (7):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  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=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat