def written_length_pair
import bendtorch-core@0.1.0.0/src/tensor/observation.bend as Observationimport Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape
import bendtorch-core@0.1.0.0/src/tensor/core.bend as Core
113def written_length_pair(-shape: Shape.Shape, pair: Core.Tensor<shape> & Result<&2, &2, Core.Error, Unit>) -> Nat:
114 (tensor, result) = pair
115 Core.logical_length(shape, tensor)