Core.Fin.left: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/shape/core.bend as Core
Lines 56-65 of bendtorch-core@0.1.0.0/src/shape/core.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&start_line=56&end_line=65

import Base

def Fin.left(+a: Nat, -b: Nat, index: Fin(a)) -> Fin(Nat.add(a, b)):
  match a:
    case 0n:
      match index:
    case 1n+p:
      match index:
        case FZero{}:
          FZero{}
        case FNext{previous}:
          FNext{Fin.left(p, b, previous)}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=Fin
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=Fin.Step