Tensor.Nat.check_eq: def of bendtorch@1.3.0.0
Import: import bendtorch@1.3.0.0/tensor.bend as Tensor
Lines 109-117 of bendtorch@1.3.0.0/tensor.bend: https://jend.leeeet.dev/read.txt?path=bendtorch@1.3.0.0/tensor.bend&start_line=109&end_line=117

import Base

# a proof that a == b, when it holds (reshape's count, read at run time)
def Nat.check_eq(a: Nat, b: Nat) -> Maybe<&1, {a == b : Nat}>:
  match a b:
    case 0n 0n:
      Some{{==}}
    case 1n+p 1n+q:
      nat_eq_succ(p, q, Nat.check_eq(p, q))
    case _ _:
      None{}

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bendtorch@1.3.0.0/tensor.bend&name=nat_eq_succ