Reduce.first_span: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/reduce.bend as Reduce
Lines 44-49 of bendtorch-core@0.1.0.0/src/autograd/reduce.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/reduce.bend&start_line=44&end_line=49

import Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape

def first_span(+rows: List<&2, Shape.Row>, +extents: List<&2, Nat>) -> Nat:
  match rows extents:
    case Shape.Row{stride, +left, right} <> rest +extent <> others:
      span(left, extent)
    case rows extents:
      0n

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/reduce.bend&name=span
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=Row