ReduceToFoldPROOF.source_below: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/reduce_to_fold_PROOF.bend as ReduceToFoldPROOF
Lines 112-116 of bendtorch-core@0.1.0.0/src/autograd/reduce_to_fold_PROOF.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/reduce_to_fold_PROOF.bend&start_line=112&end_line=116

import Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape
import bendtorch-core@0.1.0.0/src/tensor/contracts/broadcast_proof.bend as BroadcastProof
import bendtorch-core@0.1.0.0/src/autograd/reduce_fold.bend as ReduceFold

def source_below(+plan: Shape.BroadcastPlan, +shape: Shape.Shape, +right: {Shape.right_shape(plan) == shape : Shape.Shape}, +position: Nat,
  below: {Nat.is_lt(position, Shape.logical_numel(Shape.dimensions(Shape.output_shape(plan)))) == True{} : Bool}) ->
  {Nat.is_lt(ReduceFold.contribution_offset(plan, position), Shape.logical_numel(Shape.dimensions(shape))) == True{} : Bool}:
  %right : {Nat.is_lt(ReduceFold.contribution_offset(plan, position), Shape.logical_numel(Shape.dimensions(_))) == True{} : Bool}
  BroadcastProof.right_walk_bound(plan, Shape.index_map(plan), position, below)

Uses (12):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  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=bendtorch-core@0.1.0.0/src/autograd/reduce_fold.bend&name=contribution_offset
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=BroadcastPlan
  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=dimensions
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=index_map
  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/shape/core.bend&name=output_shape
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=right_shape
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/contracts/broadcast_proof.bend&name=right_walk_bound