Words32.nth_some: def of bend-collections-laws-math@1.0.0.0
Import: import bend-collections-laws-math@1.0.0.0/proofs/lib/words32.bend as Words32
Lines 59-66 of bend-collections-laws-math@1.0.0.0/proofs/lib/words32.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/words32.bend&start_line=59&end_line=66

import Base
import bend-collections-laws-math@1.0.0.0/proofs/lib/nat.bend as N
import bend-collections-laws-math@1.0.0.0/spec/lib/common.bend as SC

def nth_some(+tb: List<&2, U32>, +i: Nat, +h: {Nat.is_lt(i, SC.length(U32, tb)) == True{} : Bool}) -> {SC.nth(U32, tb, i) == Some{nth0(tb, i)} : Maybe<&2, U32>}:
  match tb i:
    case Nil{} _:
      Empty.absurd({SC.nth(U32, Nil{}, i) == Some{nth0(Nil{}, i)} : Maybe<&2, U32>}, N.lt_zero_absurd(i, h))
    case Con{x, t} 0n:
      {==}
    case Con{x, t} 1n+p:
      nth_some(t, p, h)

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Empty.absurd
  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=Nat.is_lt
  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/lib/nat.bend&name=lt_zero_absurd
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/proofs/lib/words32.bend&name=nth0
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&name=length
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-math@1.0.0.0/spec/lib/common.bend&name=nth