Bendtorch.tie_b4: def of bendtorch@1.3.0.0
Import: import bendtorch@1.3.0.0/main.bend as Bendtorch
Lines 2184-2187 of bendtorch@1.3.0.0/main.bend: https://jend.leeeet.dev/read.txt?path=bendtorch@1.3.0.0/main.bend&start_line=2184&end_line=2187

import Base

def tie_b4(-P: Type, -Q: Type, -X: Type, q: Q, gq: Q, r: Bwd<P, X>) -> Bwd<Two<P, Q>, X>:
  match r:
    case Bwd{p, dx, gp}:
      Bwd{Two{p, q}, dx, Two{gp, gq}}

Uses (2):
  https://jend.leeeet.dev/definition.txt?path=bendtorch@1.3.0.0/main.bend&name=Bwd
  https://jend.leeeet.dev/definition.txt?path=bendtorch@1.3.0.0/main.bend&name=Two