Signed.narrow_before: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/tensor/signed.bend as Signed
Lines 329-336 of bendtorch-core@0.1.0.0/src/tensor/signed.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/tensor/signed.bend&start_line=329&end_line=336

import Base
import bendtorch-core@0.1.0.0/src/tensor/core.bend as Core
import bendtorch-core@0.1.0.0/src/tensor/slice.bend as Slice

# A narrow's start before -extent: the axis check first, as the unsigned
# narrow does it, then OutOfRange.
def narrow_before(input: Core.Dynamic, refused: Maybe<&2, Slice.Error>) -> Core.Dynamic & Result<&2, &1, Slice.Error, Core.Dynamic>:
  match refused:
    case Some{error}:
      (input, Fail{error})
    case None{}:
      (input, Fail{Slice.OutOfRange{}})

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/core.bend&name=Dynamic
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/tensor/slice.bend&name=Error