Model.observe: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/storage/model.bend as Model
Lines 56-70 of bendtorch-core@0.1.0.0/src/storage/model.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/storage/model.bend&start_line=56&end_line=70

import Base

def observe(-T: Data, d: Nat, array: Array<T>, path: Path(d)) -> Maybe<&2, T>:
  match d array:
    case 0n ALeaf{x}:
      Some{x}
    case 0n ANode{xs, ys}:
      None{}
    case 1n+p ALeaf{x}:
      None{}
    case 1n+p ANode{xs, ys}:
      Step{bit, rest} = path
      match bit:
        case False{}:
          observe(T, p, xs, rest)
        case True{}:
          observe(T, p, ys, rest)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  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=bendtorch-core@0.1.0.0/src/storage/model.bend&name=Path
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/storage/model.bend&name=Step