def observe_gather
import stelliferous@0.0.2.0/proofs/traversal_cells_refinement.bend as TraversalCellsRefinementimport Base
61def observe_gather(~Owner: Type,~Model: Type,~Cell: Data,~project: Owner -> Model,result: Owner & Cell) -> Model & Cell:
62 (owner,cell) = result
63 (project(owner),cell)