ConstructionContractPROOF.attach_length: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/tensor/construction_contract_PROOF.bend as ConstructionContractPROOF
Lines 266-275 of bendtorch-core@0.1.0.0/src/tensor/construction_contract_PROOF.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/tensor/construction_contract_PROOF.bend&start_line=266&end_line=275

import Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape
import bendtorch-core@0.1.0.0/src/storage/main.bend as Storage
import bendtorch-core@0.1.0.0/src/tensor/core.bend as Core
import bendtorch-core@0.1.0.0/src/tensor/lifecycle.bend as Lifecycle
import bendtorch-core@0.1.0.0/src/tensor/observation.bend as Observation

def attach_length(+shape: Shape.Shape, +index: U32, storage: Storage.Storage,
  counted: {Lifecycle.logical_length(storage) == Shape.elements(shape) : Nat},
  kept: {Lifecycle.retained_read(Storage.get(storage, index)) == Shape.logical_numel(Shape.dimensions(shape)) : Nat}) ->
  {Observation.after_length(shape, index, Core.attach(shape, storage)) == Some{Shape.logical_numel(Shape.dimensions(shape))} : Maybe<&2, Nat>}:
  match storage:
    case Storage.Empty{}:
      attached_length(shape, index, 0n, Shape.bool_case(Nat.is_eq(0n, Shape.elements(shape))), Storage.Empty{}, {==}, counted, kept)
    case Storage.Owned{+depth, +length, array, balanced, valid}:
      attached_length(shape, index, length, Shape.bool_case(Nat.is_eq(length, Shape.elements(shape))),
        Storage.Owned{depth, length, array, balanced, valid}, {==}, counted, kept)

Uses (16):
  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_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=Shape
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=bool_case
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=dimensions
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=elements
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=logical_numel
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/storage/main.bend&name=Storage
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/storage/main.bend&name=get
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/construction_contract_PROOF.bend&name=attached_length
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/core.bend&name=attach
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/lifecycle.bend&name=logical_length
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/lifecycle.bend&name=retained_read
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/observation.bend&name=after_length