def first
import bendtorch-core@0.1.0.0/src/autograd/reduce_to_fold_PROOF.bend as ReduceToFoldPROOFimport Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape
72def first(pair: Shape.Shape & Shape.Shape) -> Shape.Shape:
73 (left, right) = pair
74 left